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pandian 8 years ago

8180 = 5, 1351 = 0, 5102 = 1, 1269 = 2, 1608 = ? pls answer me

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Aditi singh 12 years ago

An empty tank be filled with an inlet pipe ‘A’ in 42 minutes. After 12 minutes an outlet pipe ‘B’ is opened which can empty the tank in 30 minutes. After 6 minutes another inlet pipe ‘C’ opened into the same tank, which can fill the tank in 35 minutes and the tank is filled. Find the time taken to fill the tank?

Reply Like? Yes | No

Krishnendu Lakshman 12 years ago

Let the time to be taken x min, to fill the tank. so,
1st inlet pipe filles (1/42) of tank in 1 min.
2nd outlet pipe filles (1/30) of tank in 1 min.
3rd inlet pipe filles (1/35) of tank in 1 min.
now, we know that the 2nd pipe opens 12 min later; and 3rd pipe opens 18(=12+6) mins later.

To fill the tank, the 1st pipes contribution is x/42
To fill the tank, the 2nd pipes contribution is (x-12)/30
To fill the tank, the 3rd pipes contribution is (x-18)/35

The equation becomes...
[{x/42}-{(x-12)/30}+{(x-18)/35}]=1

solving the equation we get the result, x=58.5

time taken to fill the tank is 58min 30sec.

Like? Yes (2) | No

Aditi singh 12 years ago

A completes a piece of work in 3/4 of the time in B does, B takes 4/5 of the time in C does. They got a profit of Rs. 40000 how much B gets?

Reply Like? Yes (5) | No

AKASH SINGH 12 years ago

b gets= 4/12*40000 rs

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Aditi singh 12 years ago

A completes a work in 20 days B in 60 days C in 45 days. All three persons working together on a project got a profit of Rs.26000 what is the profit of B?

Reply Like? Yes (4) | No

Bholanath 12 years ago

In one day all can work =1/20 + 1/60 + 1/45= 4/45
%work by B =({1/60)/(4/45)}*100=18.75
so total profit gain by B=26000*18.75=4875

Like? Yes | No

pravallika 12 years ago

1 day work of a,b,c is 1/20:1/60:1/45=9:3:4
b share =3/16*26000=4875

Like? Yes (2) | No

Aditi singh 12 years ago

31. If P(x) = ax4+bx3+cx2+dx+e has roots at x = 1, 2, 3, 4 and P(0) = 48, what is P(5)
A. 48 B. 24 C. 0 D. 50

Reply Like? Yes (2) | No

Manish Kumar 12 years ago

option B.48 is answer

Like? Yes (1) | No

Lekha 12 years ago

can any one explain clearly

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Madhu pericherla 12 years ago

x=1,2,3,4 are roots of given equation then
k(x-1)*(x-2)*(x-3)*(x-4)=p(x)=ax4+bx3+cx2+dx+e
put x=0 then k*(-1)*(-2)*(-3)*(-4)=p(0)=48
while solving above equation we will get k=2
now put x=5 then P(5)=2(5-1)*(5-2)*(5-3)*(5-4)=2*24=48(so ans is 48)

Like? Yes (1) | No

Aditi singh 12 years ago

26. Tim and Elan are 90 km from each other.they start to move each other simultanously tim at speed 10 and elan 5 kmph. If every hour they double their speed what is the distance that Tim will pass until he meet Elan
A. 45
B. 60
C. 20
D. 80

Reply Like? Yes (6) | No

Bindiya S. Telgote 12 years ago

Tim will pass 60km until he meet to Elan

Like? Yes (1) | No

Sruthi karuturi 12 years ago

In 1st two hrs Tim travels 30km and Elan 15km
now they have a distance of 45km and here they meet in 30km
Hence 30+30=60km

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RAMASAMY 12 years ago

Ans 60km
for 1st hour tim walk 10 km
after 1hr speed is double
2nd hr he walk (10+20)km
total distance covered by 2 person after 2 hr is 45
in next 45 min they walk entire distance
then 3rd hr tim walk 30 km
tim distance=60 km
time=2 hr 45 min

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Aditi singh 12 years ago

24. In how many ways can we distribute 10 identical looking pencils to 4 students so that each student gets at least one pencil?
A. 5040
B. 210
C. 84
D. None of these

Reply Like? Yes (4) | No

VISHAL KUMAR 12 years ago

for atleast one pencil formula is n-1Ck-1 where n=10 and c=4 so u will get the answer. and if there is no such condition then it will be n+k-1CK-1

Like? Yes (3) | No

Kumar Yashvardhan Puri 12 years ago

84 will be the answer and now we will give 4 pencil to one each and then we have the solution as (9!)/(3!*6!)

Like? Yes (1) | No

Snigdha singh 12 years ago

ans: 84 (9c3) by the formula (n-1ck-1) taking n=10 and k=4

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Aditi singh 12 years ago

23. A drawer holds 4 red hats and 4 blue hats. What is the probability of getting exactly three red hats or exactly three blue hats when taking out 4 hats randomly out of the drawer and immediately returning every hat to the drawer before taking out the next?
A. 1/2
B. 1/8
C. 1/4
D. 3/8

Reply Like? Yes (4) | No

rohit tandon 12 years ago

answer is 1/8 .....

Like? Yes | No (1)

Kumar Yashvardhan Puri 12 years ago

probability of getting a red hat is 1/2 aqnd that of getting a blue hat is 1/2 . the answer will be 4*(1/2)^4 .. well here will be four arrangements possible

Like? Yes | No (1)

Aditi singh 12 years ago

21. Mr and Mrs Smith have invited 9 of their friends and their spouses for a party at the Waikiki Beach resort. They stand for a group photograph. If Mr Smith never stands next to Mrs Smith (as he says they are always together otherwise). How many ways the group can be arranged in a row for the photograph?
A. 20!
B. 19! + 18!
C. 18 x 19!
D. 2 x 19!

Reply Like? Yes (1) | No

rohit tandon 12 years ago

answer is 18 *19!...

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Kumar Yashvardhan Puri 12 years ago

18*19!
well number of aarngements of al the people is 20! but since both mr and mrs smith wont stand together the their number wil have to be reduce that is we wil have the answer as follows
20!-(19!-2) changing to 20*19!-19!*2! = 19!*18

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Aditi singh 12 years ago

19. Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, roy will be twice as old as Erik, then in 2 years what would be Roy's age multiplied by Iris's age?
A. 28
B. 48
C. 50
D. 52

Reply Like? Yes (1) | No

souvik das 12 years ago

i think ans is 48..bt nt sure

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Aditi singh 12 years ago

16. The sequence {An} is defined by A1 = 2 and An+1=An+2n what is the value of A100
A. 9902
B. 9900
C. 10100
D. 9904

Reply Like? Yes (2) | No

sindhura 12 years ago

i think answer is 9902

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Aditi singh 12 years ago

Find the sum of number between 200 and 300, which is multiple of 3?

Reply Like? Yes (2) | No

Aakash Kumar 12 years ago

a=201,l=300
no of terms=34
sum=n/2(a+l)=8517

Like? Yes (3) | No

RUSTAM 12 years ago

here no is b/w 200 to 300 so exclude 300..sum =201+204+......+297=n/2(a+l)...tn=297 so a+(n-1)d=297 n=>33 sum=(33/2)(201+297=8217

Like? Yes (1) | No

raghuram dharmavarpu 12 years ago

lease clarify we can include or exclude the 300

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Aditi singh 12 years ago

19) A white cube(with six faces) is painted red on two different faces. How many different ways can this be done (two paintings are considered same if on a suitable rotation of the cube one painting can be carried to the other)?

a. 2 b. 15 c. 4 d. 30

Reply Like? Yes (2) | No

Aditi singh 12 years ago

If x^2-16>0 , which of the following must be true?
a.-4x

Reply Like? Yes | No

RAVI GANGWAR 12 years ago

answer is X>4 x^2-16>0
X^2>16
X>4

Like? Yes (3) | No

pankaj 12 years ago

(x-4)(x=4)>0
so the ans is -4

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mani kumar 12 years ago

x^2-16>0
x^2>16
x>+4 or -4 but commanily it lies x>4

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Aditi singh 12 years ago

33) If x^2-16>0, which of the following must be true?

a)-4x

Reply Like? Yes | No

Aditi singh 12 years ago

33) If x^2-16>0, which of the following must be true?

a)-4x

Reply Like? Yes | No

Anchal 12 years ago

plz post the complete question

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Aditi singh 12 years ago

there is some problem occuring again n again...

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Aditi singh 12 years ago

33) If x^2-16>0, which of the following must be true?

a)-4x

Reply Like? Yes | No

Aditi singh 12 years ago

32) In a sequence of integers , A(n)=A(n-1)-A(n-2), where A(n) is the n'th term in the sequence, n is an integer and n>=3,A(1)=1,A(2)=1. Calculate S(1000), where S(1000)is the sum of the first 1000 terms

a)0 b)2 c)-1 d)1

Reply Like? Yes (2) | No

tejasvi gamini 12 years ago

the correct option is d..since the seq is 1,1,0,-1,-1,0.the first 996 terms get cancelles and the remaining 4 wil be 1,1,0,-1.so sum is 1

Like? Yes (3) | No

Aditi singh 12 years ago

31) All faces of a cube with an 8-meter edge are painted red. If the cube is cur into smaller cubes with a two-meter edge, how many of the two-meter cubes have paint on exactly one face?

a)24 b)36 c)60 d)48

Reply Like? Yes | No

naveen 12 years ago

24 is the answer

Like? Yes (2) | No

Sayak ghosh 12 years ago

24 is the answer

Like? Yes | No

Sayak ghosh 12 years ago

6(6-2)=24 will be the answer

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Aditi singh 12 years ago

30) There are 4 boxes colored red, yellow ,green and blue. if 2 boxes are selected,how many combinations are there for at least one green box or one red box to be selected?

a)1 b)6 c)9 d)5

Reply Like? Yes (1) | No

tejasvi gamini 12 years ago

option is correct

Like? Yes (1) | No

naveen 12 years ago

6 is the answer..

Like? Yes | No

tejasvi gamini 12 years ago

option a is crct

Like? Yes | No

Manideep 12 years ago

5 is answer
g,r
r,b
r,y
g,b
g,y

Like? Yes | No

Nirmal 12 years ago

option d.5 is correct

Like? Yes | No

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