he Search

Q:

Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:

A) 10	B) 12
C) 14	D) 16

Answer & Explanation Answer: C) 14

Explanation:

Part filled in 2 hours = 2/6=1/3

Remaining part = $(1 - \frac{1}{3}) = \frac{2}{3}$

(A + B)'s 7 hour's work = 2/3

(A + B)'s 1 hour's work = 2/21

C's 1 hour's work = { (A + B + C)'s 1 hour's work } - { (A + B)'s 1 hour's work }

=1/6-2/21 = 1/14

C alone can fill the tank in 14 hours.

Report Error

View Answer Report Error Discuss

Filed Under: Pipes and Cistern

Q:

Find out the wrong number in the series.

7, 8, 18, 57, 228, 1165, 6996

A) 8	B) 18
C) 57	D) 228

Answer & Explanation Answer: D) 228

Explanation:

Let the given numbers be A, B, C, D, E, F, G.

Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.

Clearly, 228 is wrong.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Q:

Insert the missing number.

7, 26, 63, 124, 215, 342, (....)

A) 391	B) 421
C) 481	D) 511

Answer & Explanation Answer: D) 511

Explanation:

Numbers are (2³ - 1), (3³ - 1), (4³ - 1), (5³ - 1), (6³ - 1), (7³ - 1) etc.

So, the next number is (8³ - 1) = (512 - 1) = 511.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Q:

Insert the missing number.

8, 7, 11, 12, 14, 17, 17, 22, (....)

A) 20	B) 22
C) 24	D) 27

Answer & Explanation Answer: A) 20

Explanation:

There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Q:

Insert the missing number.

2, 4, 12, 48, 240, (....)

A) 960	B) 1440
C) 1080	D) 1920

Answer & Explanation Answer: B) 1440

Explanation:

Go on multiplying the given numbers by 2, 3, 4, 5, 6.

So, the correct next number is 1440.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Q:

Find out the wrong number in the given sequence of numbers.

56, 72, 90, 110, 132, 150

A) 72	B) 110
C) 132	D) 150

Answer & Explanation Answer: D) 150

Explanation:

The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.

So, 150 is wrong.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Q:

Find out the wrong number in the given sequence of numbers.

52, 51, 48, 43, 34, 27, 16

A) 27	B) 34
C) 43	D) 48

Answer & Explanation Answer: B) 34

Explanation:

Subtract 1, 3, 5, 7, 9, 11 from successive numbers.

So, 34 is wrong.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Q:

Find out the wrong number in the given sequence of numbers.

1, 2, 6, 15, 31, 56, 91

A) 31	B) 91
C) 56	D) 15

Answer & Explanation Answer: B) 91

Explanation:

1, 1 + 1² = 2, 2 + 2² = 6, 6 + 3² = 15, 15 + 4² = 31, 31 + 5² = 56, 56 + 6² = 92

Last number of given series must be 92 not 91.

Report Error

View Answer Report Error Discuss

Filed Under: Odd Man Out

Searching for "he"

Quick Links