6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

Find the wrong number in the given number series?

10, 21, 54, 109, 189

A) 189	B) 109
C) 54	D) 21

Answer & Explanation Answer: A) 189

Explanation:

The given number series is 10, 21, 54, 109, 189

The series follows a pattern that

10 + 11 = 21

21 + 33 = 54

54 + 55 = 109

109 + 77 = 186

Hence the wrong number in the given number series is 189.

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5 53211

Q:

Simplify the following expression?

40% of ( $\frac{24}{4} x ?$ ) = 48

A) 24	B) 22
C) 20	D) 18

Answer & Explanation Answer: C) 20

Explanation:

We know that

$40 % = \frac{40}{100} = \frac{2}{5} \Rightarrow \frac{2}{5} x \frac{24}{4} x ? = 48 ? = \frac{48 x 5 x 4}{2 x 24} = 20$

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3 53139

Q:

The average of two numbers is 10 and the product of two numbers is 96. Find the two numbers.

A) 3, 32	B) 12, 8
C) 1, 96	D) 24, 4

Answer & Explanation Answer: B) 12, 8

Explanation:

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Filed Under: Average
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2 53132

Q:

What percent of 7.2 kg is 18 gms ?

A) .25%	B) .5%
C) .75%	D) 1%

Answer & Explanation Answer: A) .25%

Explanation:

Required percentage = (18/7200 * 100)% = 1/4% = 0.25%

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200 53102

Q:

A man sitting in a train which is traveling at 50 kmph observes that a goods train, traveling in opposite direction, takes 9 seconds to pass him. If the goods train is 280 m long, find its speed.?

A) 60	B) 62
C) 64	D) 65

Answer & Explanation Answer: B) 62

Explanation:

Relative speed =280/9 m / sec = (280/9*18/5) kmph = 112 kmph.

Speed of goods train = (112 - 50) kmph = 62 kmph.

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140 53058

Q:

Which of the following statement(s) is/are TRUE?

I . $\frac{1}{1 \times 3} + \frac{1}{3 \times 5} + \frac{1}{5 \times 7} + . . . + \frac{1}{11 \times 13} = \frac{12}{13}$

II. $\frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + . . . + \frac{1}{12 \times 13} = \frac{12}{13}$

A) Only I	B) Only II
C) Both I and II	D) Neither I nor II

Answer & Explanation Answer: B) Only II

Explanation:

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0 53055

Q:

Find the Odd One Out?

3, 4, 14, 48, 576, 27648

A) 4	B) 14
C) 48	D) 27648

Answer & Explanation Answer: B) 14

Explanation:

Given Number series is :

3 4 14 48 576 27648

It follows a pattern that,

3

4

4 x 3 = 12 but not 14

12 x 4 = 48

48 x 12 = 576

576 x 48 = 27648

Hence, the odd one in the given Number Series is 14.

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4 52845

Q:

In each of these questions, two equations (I) and (II) are given.

$I . 2 x^{2} + 19 x + 42 = 0 II . 4 y^{2} + 43 y + 30 = 0$

A) x > y	B) x < y
C) x ≥ y	D) x ≤ y

Answer & Explanation Answer:

Explanation:

I. 2x2 + 19x + 42 = 0

2x2 + 12x + 7x + 42 = 0

2x (x+6) + 7(x +6) = 0

(2x+7) (x+6) = 0 x = -7/2, -6 I

I. 4y2 + 43y + 30 = 0

4y2 +40y + 3y + 30 = 0

4y(y + 10) + 3(y + 10) (4y + 3)(y + 10) = 0

y = -3/4, -10

So answer is no relation.

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Quantitative Aptitude - Arithmetic Ability Questions

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