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Ramakrishna 11 years ago

Q: The minimum value of sin^n A + cos^n A+ sec^n A+ cosec^ A+ tan^n A +cot^n A ? I NEED COMPLETE SOLUTION PLS HELP ME

a) 3 b) 5 c) 7

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Ramrup Chatterjee 11 years ago

ans of the solution is+> a) 3

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AMREEN 11 years ago

let n=2
Sin^2A+cos^2A=1
Sec^2A+tan^2A=1
Cosec^2A+Cot^2A=1
then the adding all three we get answer is 3

Like? Yes | No (2)

Ramakrishna to Shravya 11 years ago

Q: Three numbers aree in G.P. Their sum is 21 and their product is 216. These three numbers are? I NEED COMPLETE SOLUTION PLS HELP ME

Reply Like? Yes | No

NAVEEN KUMAR 11 years ago

Let the three numbers in a G.P. be a/r, a, ar
a/q
(a/r)*(a)*(ar)=216
=>a^3=216
=>a=6
&
(a/r)+a+(ar)=21
put a=6
6/r+6+6r=21
=>r=1/2 or 2
if r=2
3,6,12
if r=1/2
12,6,3

Like? Yes (3) | No

Ramakrishna to Shravya 11 years ago

thanks you shraav

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Ramakrishna 11 years ago

Q: The number of bacteria in a certain culture doubles every 30 minutes. If there are 20 bacteria present in the culture orginally, howmany bacteria will be present at the end of two hours? I NEED COMPLETE SOLUTION PLS HELP ME

Reply Like? Yes | No

Shravya 11 years ago

After 30min 40
60min 80
90min 160
120 min(2 hrs) 320

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Ramakrishna to Naveen Mittal 11 years ago

how? i need complete solution

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Ramakrishna 11 years ago

Q: A person writes a postcard to five of his friends.He asks each one of them to copy the letter and mail to five diffrent persons with the insruction that they move chain similarly. Assume that the chain is not broken. Determine how many postcards are posted in all when the eighth set of letters are mailed?

a) 15625 b) 78125 c) 97656

Reply Like? Yes | No

Naveen Mittal 11 years ago

390625 is the right answer

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Prashant 11 years ago

5^8 = 390625 is the answer

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Ramakrishna 11 years ago

Q: Median of a data arranged in ascending order 7,10,15,x,y,27,35 is 17 and when one more observation 50 is added the median has become 19, what is y? I NEED COMPLETE SOL. PLS HELP ME

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sowjanya 11 years ago

the ans is 21.
for the given series the median is x
so x = 17, from given data
when 50 is added to series
we have two medians both x and y , so its d avg of them
(x+y)/2 =19
(17+y)/2 =19
y =21

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Ramakrishna to Murali Tekumatla 11 years ago

Q: A rope makes 140 rounds of the circumference of a cylinder, the radius of whose base is 14cm. How many times can the same rope go round a cylinder with radius 20cm? I NEED COMPLETE SOLUTION PLS HELP ME

a) 28 b) 98 c) 116 d) none

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Anurag Dwivedi 11 years ago

It is making 140 rounds of the crcmfrnce so length of the rope will be= 140 * 2*pi*r ------>here (r=14 cm)
l= 140*14*2*pi....................eqtn 1
Now when radius is 20 cm.. so Suppose round is X
l= X*2*pi*r---------------> here(r=20 cm)
l= X*20*2*pi ................. eqtn 2
Nw equate both equation
X= 98

Like? Yes (2) | No

Ramakrishna to Murali Tekumatla 11 years ago

Q: The marked price of an object is rs 1920. The shopkeeper allows a discount of 10% and gains 8%. If no discount is allowed his gain percent would be? I NEED COMPLETE SOLUTION PLS HELP ME

a) 18% b) 20% c) 22.5% d) none

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Murali Tekumatla 11 years ago

Marked price =1920
discount =10%
so SP = 1920-10% of 1920
= 1728

gain is 8% then CP=
1728*(100/108)=1600
CP = 1600, SP=1920(at no discount)
then gain %is ( 320/1600)*100=20%

option b is correct

Like? Yes (3) | No

Murali Tekumatla 11 years ago

Marked price =1920
discount =10%
so SP = 1920-10% of 1920
= 1728

gain is 8% then CP=
1728*(100/108)=1600
CP = 1600, SP=1920(at no discount)
then gain %is ( 320/1600)*100=20%

option b is correct

Like? Yes | No

sandeep kumar 11 years ago

M.p=1920rs and discount=10%
so 10% of 1920 is 1728 i.e. sp=1728rs
gains 8% so cp= sp*100/(100+gain%)
1728*(100/100+8)=1600
At no discount...
sp=1920,cp=1600
diff between sp and cp is 320
the formula is (sp-cp/cp)*100=( 320/1600)*100=20%
so anser is OPTION B

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Ramakrishna to ABHILESH PURI GOSWAMI 11 years ago

Q: Twice the square of number is the cube of 18. The number is ? I NEED COMPLETE SOLUTION PLS HELP ME

a) 54 b) 108 c) 432 d) none

Reply Like? Yes | No

Rupesh Chouksey 11 years ago

2x^2=18^3
solve this exp
ans is 54

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Murali Tekumatla 11 years ago

let number = x
sqr of num = x*x
twice the sqr of num = 2*x*x
is equal to 18*18*18

2*x*x= 18*18*18

x*x=9*18*18

x*x=3*3*18*18

apply root both side

x=3*18 = 54 ans

Like? Yes (1) | No

AMREEN 11 years ago

ans=54
2*x^2=18^3
2*x^2=5832
x2=2916
x=54

Like? Yes (1) | No (1)

AAKANCHA SRIVASTAV 11 years ago

ans is 54
let the no. is x
then
2x^2=18*18*18
x^2=(18*18*18)/2
x^2=18*18*9
x=18*3
x=54

Like? Yes (2) | No

Prakher Mehrotra 11 years ago

Let the number be x
2x^2=18^3
x^2=(18*18*18)/2
x^2=18*18*9
x=(18*18*9)^1/2
x=3*3*2*3
x=54

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Pragna Paramita Pal 11 years ago

54 because 2x^2=18^3;
x^2=18*18*18/2
x^2=9*18*18
x=9*18=54

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Ramakrishna to RAKESH 11 years ago

A clock shows 3:00. What time is it after the hour hand rotates 135 degrees? I need complete solution? pls help me

Reply Like? Yes | No

madanpal vishwakarma 11 years ago

the required time is 7:12 because to move 130 degree it require to move up to 7 and then for 5 degree it need to movie 5 degree which is equal to move 12 minute sot ime is 7:12 after moving 135degree of hour hand

Like? Yes | No

B. Mahesh 11 years ago

7:30,hr hand rotates from 3 to 6 such that 90 degrees,i.e.,3 hrs,remaining 45 degrees is 1:30hrs

Like? Yes (1) | No

mohan bylapudi 11 years ago

for every hour hour hand moves 30 degrees =>135/30=4+15/30=>1hr=30degree=>1/2hr=15degree. Therefore 3+4+1/2hr=7:30hr

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Nikhil Awasthi 11 years ago

yes its 7:30 in order to move 135* we move hour hand 90 degree as it reaches 6:00 and then we know each partition in clock is of 30* so we again move hour clock one hour as 90+30= 120* as 7 o clock. . to move rest 15* we move hour hand half partition as 15* which completes 135 * ans clock is now showing 7:30

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Ramakrishna to Deep Narayan Mojumder 11 years ago

Two towers of height 30m and 38m are built at a distance of 15m. The distance between the tops of two towers is? I NEED COMPLETE SOLUTION PLS HELP ME

a)17m b)16m c)15m

Reply Like? Yes | No

AMIT GUPTA 11 years ago

distance b/w the top of two towers is same as distance at which two towers built .. so answer is 15m

Like? Yes | No (1)

Niveditha Ravichandran 11 years ago

let dist b/w two tops be x
unknown distance is hypotenuse of right angled triangle. opp side and adjacent sides are known.
x^2= 15^2 + (38-30) ^2
x^2= 225 + 64
x^2=289
x= 17

Like? Yes (5) | No

kanimozhi 11 years ago

the distance will be same....so ans is 15

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Ramakrishna to Deep Narayan Mojumder 11 years ago

An equilateral triangle is inscribed in a circle with a radius of 6cm Find its one side in cm?

I NEED COMPLETE SOLUTION PLS HELP ME

Reply Like? Yes (2) | No

Deep Narayan Mojumder 11 years ago

Sqrt(3)/2 * one side of the equilateral triangle = 6+3 = 9[Vide the 2:1 property of equilateral triangle and I am not able to show you the appropriate diagram here]
Hence, side = 6 sqrt(3) in cm.

Like? Yes (2) | No

Rohit Shaw 11 years ago

the center of circle and centroid of triangle are the same point.
centroid divides the median into ratio of 2:1.
radius = 6
(2/3)part of median is radius
2/3 of height = 6
height = 9
√3/2 * side = height=9
side = 6√3 cm

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Ramakrishna to Deep Narayan Mojumder 11 years ago

The inner diameter of a circle well is 4.2m It is 20m deep The cost of plastering of this curved inner surface at the rate of rs 40 per m^2 is? I NEED COMPLETE SOLUTION PLS HELP ME

a) 5280 b) 10260 c) 10560

Reply Like? Yes (2) | No

Devendra Marghade 11 years ago

c) 10560
Curved surface area of cylinder= 2*Pi*r*h
Here r=2.1 ,h=20
So area=2*(22/7)*2.1*20= 264 sq. m.
Cost @40 rs./sq.m.=264*40=10560

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Deep Narayan Mojumder 11 years ago

You have got the solution again and thank you so much once again for asking me this question.

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Ramakrishna to Deep Narayan Mojumder 11 years ago

A rubber ball is dropped from a certain height. It is found to rebounce only 80% of its previous height. If it is dropped from the top of a 25m tall building, to what height would it raise in meters after bouncing on the ground two times?

a) 16 b) 18 c) 20

Reply Like? Yes (4) | No

Nomendra Sinha 11 years ago

80% of 80% of 25
i.e. (80/100)(80/100)*25=16

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Deep Narayan Mojumder 11 years ago

I think you have got your answer...

Like? Yes (3) | No

ANURAG VARDHAN 11 years ago

80% 0f 25=20 and again 80% of 20 = 16

Like? Yes (3) | No

Ramakrishna to Deep Narayan Mojumder 11 years ago

Each plant in a nursery requires 2 liters of water for a day. A water tanker of length 4m, breadth 2m, height 1m brings water once in every day. Find the number of plants for which this water is sufficient?

I NEED COMPLETE SOLUTION PLS HELP ME

Reply Like? Yes (2) | No

Deep Narayan Mojumder 11 years ago

I think Niveditha Ravichandran has already answered it.
First of all, you need to know that, 1 Cubic Meter = 1000 Litres. If you know it, then it is very easy.
According to the given problem, volume of the water tanker = length*breadth*height = 4*2*1 = 8 Cubic Meter = 8*1000 = 8000 Litres.
Given, each plant in a nursery requires 2 litres of water for a day.
Hence, number of plants for which this water is sufficient = 8000 / 2 = 4000. (Answer)

Like? Yes (4) | No

Ramakrishna to Vuyani 11 years ago

A regular square pyramid is 4 m height and perimeter of its base is 24m the volume of pyramid in cubic meter?

a) 48 b) 68

Reply Like? Yes | No (2)

K.Sailja 11 years ago

can you please give me solution??????????????

Like? Yes | No (1)

Inline Geek 11 years ago

48, volume of pyramid = 1/3 * (base area * height of the pyramid)

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Ramakrishna to SWARNA 11 years ago

ans is 30..... i need complete solution pls help me

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Ramakrishna to Saraswathy 11 years ago

How many cubes of side 2cm can be cut from a wooden block whose length is 10 cm breadth is 7 cm and height is 5 cm?

a) 30 b)43

Reply Like? Yes | No (1)

SWARNA 11 years ago

30 cubes can be made. .............................

Like? Yes | No (2)

shilpi 11 years ago

43 cubes can be made and can be calculated as (vol. of wooden block/vol of 1 cube)

Like? Yes (2) | No (1)

Ramakrishna 11 years ago

@ Hello saraswathi according to answer key the ans is 30 but how i need complete solution

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Saraswathy 11 years ago

It seems its not related to volume....
Divide each side by 2 nd multiply the quotients
[10/2] * [7/2] * [5/2] => 5*3*2 = 30

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mac 10 years ago

@saraswathy can you explain the logic ?

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Ramakrishna to Saraswathy 11 years ago

@Saraswathy u r soooo.... clever problem solving maths

Reply Like? Yes | No (1)

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