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"Obvious" is the most dangerous word in mathematics.

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(9 years ago) "Other"

The net selling price of a dozen pens is Rs.256.50. If successive discounts of 10% and 5% were allowed, Find the marked price.

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(9 years ago)

Method 1:
Net price of pen is 256.50
after adding a discount of 10% new cost will be : 256.50 - 10% of 256.50
=> 230.85
Again adding an 5 % discount Final rate : 230.85 -5% of 230.85
=> 219.307

OR
Method 2:
if a object have successive discount of 10% and 5% then
lets assume its value is 100
and after these 2 discount value will be : 100- 10% of 100 = 90 and 90- (5% of 90 )=> 85.5
Than
100 rs value after 2 successive discount is : 85.5
1 rs .................................................................:85.5/100
256.5 rs .................................................................: 85.5/100*256.5= 219.3075

Choose your method :P

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(9 years ago)

((95/100)*(90/100))*m=256.50
=>m=(256.50*10000)/(95*90)=>300
so marked price is 300

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(9 years ago) "Other"

is anyone having any idea regarding online assessment test by greymeter?

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(9 years ago) "Other"

has anyone got the result of elitmus exam held on 20th sept 2015 in belgaum center ?

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(9 years ago) "Other"

the equal lengths of a sticks are used to form the triangles if 840 such sticks are used then howmany triangles can be formed ?

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(9 years ago)

its very lengthy and complicated question it requires lots of calculation
i am not going to do that but still i am giving an idea to solve this problem
you have to make cases of all type of triangle such as
equilateral triangle: 3,6,9,12,15...........and so on
Isosceles triangle: 6,8,9,11 ...........and so on
Scalene triangle: 9,12 ...........and so on
try to make all case if not you will not get your answer

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(9 years ago) "Other"

1) One grand father has 3 grand children two of the age difference is 3.Eldest child age is 3 times the youngestchilds age and the eldest child age is two year more than the sum of other two children. Find what is the age ofthe elders child?

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(9 years ago)

LET Y BE YOUNGEST SON AGE, X BE MIDDLE SON..... SO
ELDEST SON AGE=3Y

X-Y=3..........(2)
X+Y+2=3Y
SOLVING V GET Y=5, X=8

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(9 years ago) "Other"

Out of 17 applicants 8 boys and 9 girls. Two persons are to be selected for the job. Find the probability that at least one of the selected persons will be a girl.
ans

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(9 years ago)

no.of ways of selecting two persons out of 17 applicant; n(S)= 17C2 *2! = (17*16)/2 *2=272
At least one girl means 1 or more girl and they can be selected in two possible ways i.e.
(1 girl + 1 boy) or (2 girls)
no. of ways of selecting at least one girl ;n(E) = (9C1*8C1) +(9C1*8C1) = 9*8 +9*8 = 144
P(E)=n(E)/n(s) =144/272 =0.53

Like? Yes | No (2)

(9 years ago)

The events of selection of two person is redefined as (i) first is a girl AND second is a boy OR (ii) first is boy AND second is a girl OR (iii) first is a girl and second is a girl.

So the required probability:
(9/17 * 8/16) +(8/17 * 9/16) + (9/17 * 8/16)
= (9/34)+(9/34)+(9/34)
=27/34

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(9 years ago)

n(s)=17C2
n(e)=17C2-8C2
i.e., if we subtract selection of two boys from all possibilities remaining possibilities shall have atleast
one girl included

probability=(17C2-8C2)/17C2

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(9 years ago)

ans is 0.74 or 27/34

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(9 years ago) "Other"

A person starting with 64 rupees and making 6 bets, wins three times and loses three times, the wins and loses occurring in random order. The chance for a win is equal to the chance for a loss. If each wager is for half the money remaining at the time of the bet, then the final result is
ans . ?

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(9 years ago)

As the win leads to multiplying the amount by 1.5 and loss leads to multiplying the amount by 0.5, we will multiply initial amount by 1.5 thrice and by 0.5 thrice (in any order).

The overall resultant will remain same.
So final amount with the person will be (in all cases):
=64(1.5)(1.5)(1.5)(0.5)(0.5)(0.5)= Rs 27
Hence the final result is:
64−27=37: A loss of Rs 37

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(9 years ago) "Other"

1. The appropriate atmospheric conditions made it feasible for the astronomers to see the stars and they could even distinguish the sizes. Select the correct alternative for Bolded Words
a. And even distinguish the sizes
b. And they were even distinguishing the sizes
c. And he could even distinguishing the sizes
d. And even distinguishing the sizes

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(9 years ago) "Other"

we hav got alot of question here bt no correct answer .plz send me the answer of these question of amcat

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(9 years ago) "Other"

please tell me if any 1 know about the syllabubs of radisys aptitude and send the me placement papers also on this mail id
kavyarastogibca@gmail.com

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to (9 years ago) "Other"

Probability of one of the power plants over heating is 0.15 per day and the probability of failure of the backup cooling system is 0.11. if these events are independent, what is the probability of ‘big trouble’ (i.e., both evnets taking place)?

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(9 years ago)

Answer is : 0.0165
Probability of power plant over heating is : 0.15.
Probability of failure of backup cooling system is : 0.11.

Probability of Big Problem is : Backup cooling system fails as well as power plant over heating
: (0.15) *(0.11)
: 0.0165

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(9 years ago) "Other"

A permutation is often represented by the cycles it has. For example, if we permute the numbers in the natural order to 2 3 1 5 4, this is represented as (1 3 2) (5 4). In this the (132) says that the first number has gone to the position 3, the third number has gone to the position 2, and the second number has gone to position 1, and (5 4) means that the fifth number has gone to position 4 and the fourth number has gone to position 5. The numbers with brackets are to be read cyclically. If a number has not changed position, it is kept as a single cycle. Thus 5 2 1 3 4 is represented as (1345)(2). We may apply permutations on itself If we apply the permutation (132)(54) once, we get 2 3 1 5 4. If we apply it again, we get 3 1 2 4 5 , or (1 2 3)(4) (5) If we consider the permutation of 7 numbers (1457)(263), what is its order (how many
times must it be applied before the numbers appear in their original order)?

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(9 years ago)

shelly your question is not clear .
please make it clear so that it could be understandable

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(9 years ago) "Other"

A box contains 20 balls. In how many ways can 8 balls be selected if each ball can be repeated any number of times?

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(9 years ago)

answer is 20c8 * 8!

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(9 years ago) "Other"

send me recent AMCAT placement question papers to my mail id girijaanbu14@gmail.com

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(9 years ago) "Other"

8,8,6,2,_ what is next number

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(9 years ago) "Other"

Pipe A can fill a tank in 4 hours.There is a hole at the bottom due to which it takes double time to fill the tank.After filling the tank full,the Pipe A is closed.How long does it take to empty the tank by itself due to leakage?

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(9 years ago)

let x hrs be the time taken to empty the tank

from given data we can write

(1/4)-(1/x)=(1/8)
=>1/x=1/8

so it takes 8hrs

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(9 years ago)

(1/4)-(1/x)=(1/8)
=>1/x=1/8
=>x=8hrs to empty the tank

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(9 years ago)

The answer for this question is :2hr 40 min

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(9 years ago) "Other"

When the numerator of a fraction is decreased by 20% and its denominator is decreased by 50%, the new fraction obtained is 4/3 . Find the original fraction?
A) 4/7 B) 5/7 C) 5/6 D) 6/7 E) None of these

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(9 years ago)

its option c.. 5/6

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(9 years ago)

its C) 5/6

take X/Y as original fraction

new fraction will be 0.8* X/0.5*Y
which is equal to 4/3
on solving this we will get
ans 5/6

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(9 years ago) "Other"

the salary received by officer A is 5% more than that received by officer B but 12 1/2 % less than that received by officer C. if the officer C received x% more than what is received by officer B, then the value of x will be

Reply Like? Yes (17) | No (2)

(9 years ago)

the value of x will be 20

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(9 years ago)

Will you plz..explain, how the x= 20

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(9 years ago) "Other"

A car travels a certain distance taking 7 hrs in forward journey,during return journey increase speed 12km/hr takes time 5hrs.what is distance travelled

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(9 years ago)

distance travelled is 210 km

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to (9 years ago) "Other"

Visit here daily, make a habit of it.

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(9 years ago) "Other"

A house wife spends of an article is 80% of the price at which it is marked for sale . How much % does the tradesman gain after allowing a discount of 12%

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(9 years ago) "Other"

If the ratio of the cost price and the selling price is 5:6, the gain percent is

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(9 years ago)

20

If Cost Price=5x & Selling Price=6x, then Gain%=100*(6x-5x)/5x=20

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to (9 years ago) "Other"

hi maneesha wt r u doing?

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(9 years ago) "Other"

A,B,C are three friends the average age of any two of them exceeds one third the age of third by 10 years.find the age of A.

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to (9 years ago) "Other"

hiiiiiiiiii how r u

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(9 years ago)

hiii ... i am gud

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(9 years ago) "Other"

and it raises the questions of weather a pieceful ___________of diputes between the ttwo is possible,despite intensive_________ by the us
a) outcome,compelling b)resolution,cajoling c) result,filtering d)answer,persuasion
i need answer for this

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(9 years ago) "Other"

There is a set of 32 distinct points on a plane with the following characteristic:
There is a subset A consisting of ten collinear points.
Any subset of three or more collinears point from 32 are a sub set of A.
how many distinct triangles with positive area can be formed with each of its vertices being one of the 32 points?(Two triangles are said to be distinct if at least one of the vertices is differently)
a) 4190 b)3850 c)4840 d)1540

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to (9 years ago) "Other"

hi lets be frnd on fb if u r intersted

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(9 years ago)

ya sure.........

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(9 years ago) "Other"

5+3+2=151012
9+2+4=183662
8+6+3=482466
5+4+5=202504
7+2+5=?

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(9 years ago)

ans:143542 (7*2,7*5,rev((7+5)*2))

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(9 years ago)

it is a best question ever

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(9 years ago)

7x2=14
7x5=35
7+5=12, 12x2=24 reverse it 42
Añs is 143542.

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(9 years ago)

answer will be 143542

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(9 years ago) "Other"

How to solve probability question?

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(9 years ago) "Other"

Y=x/(x-y), where k is a constant and x s a real number...
1.y increases with x.
2.y first increases then decreases with x.
3.y decreases and then increases with x.
4.y remains constant.

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(9 years ago) "Other"

amrita.ece09@yahoo.in ( Few seconds ago) "Other"
image: http://www.m4maths.com/discussion-board.php

Y=x/(x-y), where k is a constant and xX s a real number...
1.y increases with x.
2.y first increases then decreases with x.
3.y decreases and then increases with x.
4.y remains constant.

Reply Like? Yes | No

(9 years ago) "Other"

Y=x/(x-y), where k is a constant and xX s a real number...
1.y increases with xX.
2.y first increases then decreases with xX.
3.y decreases and then increases with xX.
4.y remains constant.

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to (9 years ago) "Other"

FRIENDS ............

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(9 years ago) "Other"

how many different ways th word MINIMUM can be arranged so that M,s neve rcome together

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(9 years ago)

I think (7!)/(3!*2!) = 420 ways

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(9 years ago)

there will be 2 combination such as :
place M at Even position OR place M at odd postion
=> 4C3 *4!/2! + 3C3 * 4!/2!
=>48+ 12
=> 60

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(9 years ago) "Other"

a man can dig a pit in 20 days if a man works half as much as a boy,then 4 men and 9 boys dig a similar pit in
a.10 days
b.12 days
c.15 days
d.16 days
Answer with explanation

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(9 years ago)

options are wrong as 1 man can dig in 20 days then 4 men can do it in 5 days and 4men & 9 boys together will require even lesser time

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(9 years ago)

16 days if 8 man...

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(9 years ago)

10/11 days

A boy with twice the efficiency can dig a pit in 20/2=10 days,
4 men and 9 boys 1 day work=(4/20)+(9/10)=22/20
So days require to dig similar pit=20/22=10/11

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(9 years ago) "Other"

from where the test will start

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(9 years ago) "Other"

One fifth of a number is equal to 5/8 of other number. If 35 is added to first number, it becomes four times of the second number. The second number is
A) 25 B) 40 C) 70 D) 125

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(9 years ago)

its b 40
1/5 *x =5/8 *y
x+35 = 4y
solving y=40

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(9 years ago)

Ans is (B) 40
by 1st relation x*(1/5) = y* (5/8)
and
by 2nd relation x+35 = 4*y
solve them by puting value of x from 1st equation to 2nd.
Y will be 40

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to (9 years ago) "Other"

hi bro first of all congratulate to be a part of this event

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(9 years ago) "Other"

Sixteen men can complete a work in twelve days. Twenty-four children can complete the same work in eighteen days. Twelve men and eight children started working and after eight days three more children joined them. How many days will they now take to complete the remaining work ?

A) a. 2days
B) b. 4days
C) c. 6days
D) d. 8 day

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(9 years ago) "Other"

Two numbers are such that the square of one number is 224 less than 8 times the square of the other. If the numbers be in ratio of 3:4, their values are?

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(9 years ago)

(x^2+224)=8(y^2)
3x=4y
x=4y/3
((4y/3)^2)+224)=8(y^2)
(16/9y^2)+224=8(y^2)
(16/9y^2)+224=72/9(y^2)
(56/9)y^2=224
56y^2=2016
y^2=36
y=6
3x=4y
3x=24
x=8

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(9 years ago)

thanks yashi.. :)

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(9 years ago)

lets numbers be 3x and 4x, then
16x^2 = (8*9x^2)-224
16x^2 = 72 x^2 - 224
56x^2 = 224
x^2 =4 => x=2
therfore two numbers are 6,8

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(9 years ago) "Other"

Suppose a big circle radius " r= 14 m" is the diameter for the small circle. Find the area of small circle in square meters?
a) 124 b)134 c)224 d)154

Reply Like? Yes | No (1)

(9 years ago)

134
r of smaller circle = 14/2 = 7
ar. of smaller circle = pi*7*7
=134 sq. meters

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(9 years ago)

Sorry kriti, right answer is
( 22/7 )*7*7 = 154

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(9 years ago)

small circle daimeter = 14 m
therfore area =(22*14*14)/(7*4) = 154

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(9 years ago)

ans is (D) 154
Radius of smaller circle = 14/2 = 7
so Area will be = (22/7)*7*7
=154 sq. meters

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(9 years ago) "Other"

equilateral triangle and regular hexagon has same perimeter. find the ratio of their areas?

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(9 years ago)

ratio of their areas will be 2:3

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(9 years ago)

2:3
hexagone consists of 6 equilateral triangles
so ratio of their ares = x^2 : 6 y^2
and we know,3x=6y ==> x=2y
putting it, ratio will come out to be 2:3

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(9 years ago) "Other"

In a circle the length of the chords are 6 and 8 respectively and the distance between them is 1 unit. What is the diameter of the circle?

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(9 years ago)

diametre of circle=10 units

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(9 years ago)

@manish please provide explanation and if u know any shortcut tricks please do share

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(9 years ago)

Akshat send your email id so that i can send snapshot of solution.

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(9 years ago)

my email id is mokashi.akshat17@gmail.com

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(9 years ago) "Other"

A can do piece of work in 10 days.B can do it in 15 days. C in 20 days. After 2 days A left and B left before 3 days of completion of the work. So the work is completed in how many days ?
asked in tcs

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(9 years ago)

let work is completed in d days.
b work for (d-3) days
c work for d days.
so,work done by a in 2 day+work done by b in (d-3) day+work done by c in d day=1.
calculating d we get d=60/7 day

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(9 years ago) "Other"

100 students appeared for test. 60 passed in first ,40 in second and 30 in both. What is the probability that a student selected at random is failed in both.

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(9 years ago)

prob of selecting student failed in both = 3/10 = .3

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(9 years ago) "Other"

Rs. 49 were divided among 150 children. Each girl got 50 paisa and a boy 25 paisa. How many boys were there?

OPTION 1) 100
2) 102
3) 104
4) 105
5) 106
6) 109
7) 110
8) 112
9) 114
10)None of these

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(9 years ago)

3) 104 is the correct answer

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to (9 years ago) "Other"

u want the correct answer,

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(9 years ago) "Other"

In a right angled triangle, two sides are consecutive whole number in which one side is hypotenuse. what could be the possible length of third side?

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(9 years ago)

49/15--x = 0.25
=> x = 46
now No. of boys will 150-46 = 104

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(9 years ago)

Let the length of hypotenuse side be x
Hence, the length of second side =x-1
Let the length of third side be y
Using pythagaros theorem,
x^2=(x-1)^2+y^2
x^2=x^2-2x+1+y^2
0=-2x+1+y^2
y^2=2x-1
y=√(2x-1)
example:
x=5
x-1=4
y=√(2*5-1)= √(9)=3

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(9 years ago)

all the odd no.s can be the third side

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(9 years ago) "Other"

A container contains milk and water in the ratio 4:1 How much mixture should be taken out and replaced with water so that the container contains milk and water in the ratio of 3:2?

Explain pls

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(9 years ago)

Ans:25%

Let the initial mixture content be 100 litres
Ratio 4:1
4x+1x=100
5x=100
X=20
mixture Ratio Litres(100)
milk 4 80
water 1 20

Let R litre of the mixture be replaced with water
Now, let us first consider the mixture content
Ratio 4:1
4x+1x= (100-R)
5x= (100-R)
X= ((100-R)/5)

mixture Ratio Litres(100-R)
milk 4 4*((100-R)/5)
water 1 1*((100-R)/5)

Now, let us consider the new mixture content
(100-R)+R=100
where,
(100-R)-->Original solution
R-->Replaced water

Given: ratio 3:2
3x+2x=100
5x=100
X=20

mixture Ratio Litres(100-R)+R=100
milk 3 60= 4*((100-R)/5)
water 2 40= 1*((100-R)/5)+R

60=4*((100-R)/5)
15= ((100-R)/5)
75=100-R
R=25

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