6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

Odd man out of the series

90 72 56 42 36 20

A) 20	B) 36
C) 42	D) 56

Answer & Explanation Answer: B) 36

Explanation:

The given number series is 90 72 56 42 36 20

9 x 10 = 90

8 x 9 = 72

7 x 8 = 56

6 x 7 = 42

5 x 6 = 30 (not 36)

4 x 5 = 20

Hence, the odd man in the given number series is 36.

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Q:

∆DEF is right angled at E. If secD = 17/8, then what is the value of cosF?

A) 15/17	B) 15/8
C) 8/17	D) 17/15

Answer & Explanation Answer: A) 15/17

Explanation:

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Q:

Pick the odd man out of the folowing number sequence?

123 112 133 112 143

A) 143	B) 122
C) 133	D) 112

Answer & Explanation Answer: B) 122

Explanation:

Here the given series is 123 112 133 112 143

It follows a pattern that,

123

123 - 11 = 112

112 + 21 = 133

133 - 31 = 102 (not 122)

102 + 41 = 143

Hence, the odd man in the given number sequence is 122 instead of 102.

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4 40679

Q:

The two equations x - 4y = 0 and 4x + 3y = 19 have a solution (a, b). Find the value of $\frac{ab}{a + 4 b}$ .

A) 1/4	B) 1/2
C) 1	D) 23

Answer & Explanation Answer: B) 1/2

Explanation:

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Q:

$What is the value of (2 + \tan 60^{0}) ?$

A) 3	B) 2/√3
C) 4/√3	D) 2+√3

Answer & Explanation Answer: D) 2+√3

Explanation:

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Q:

ΔXYZ is right angled at Y. If sinX = 4/5, then what is the value of cosZ ?

A) 3/4	B) 5/3
C) 4/5	D) 4/3

Answer & Explanation Answer: C) 4/5

Explanation:

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Q:

Find the next number in the given number series?

11, 5.5, 10, 6.5, 9, ?

A) 6.5	B) 7.5
C) 8.5	D) 10.5

Answer & Explanation Answer: B) 7.5

Explanation:

The given number series follows a pattern that

11

11 - 5.5 = 5.5

5.5 + 4.5 = 10

10 - 3.5 = 6.5

6.5 + 2.5 = 9

9 - 1.5 = 7.5

Hence, the next number in the given number series is 7.5.

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Q:

A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:

A) 720	B) 900
C) 1200	D) 1800

Quantitative Aptitude - Arithmetic Ability Questions

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