6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

What will come in place of the question mark (?) in the following number series ?

12, 24, 26.5, 79.5, ?, 330

A) 211	B) 101.5
C) 82.5	D) 99

Answer & Explanation Answer: C) 82.5

Explanation:

The given series

12 24 26.5 79.5 ? 330 follows a pattern that,

12 x 2 = 24

24 + 2.5 = 26.5

26.5 x 3 = 79.5

79.5 + 3 = 82.5

82.5 x 4 = 330

Hence, the missing number is 82.5

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9 54224

Q:

${(a - b)}^{2} + 2 ab = ?$

A) a2 - b2	B) a2 + b2
C) a2 - 4ab + b2	D) a2 - 2ab + b2

Answer & Explanation Answer: B) a2 + b2

Explanation:

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3 54095

Q:

$23 - [24 - 25 - (26 - \bar{27 - 28})] = ?$

A) -2	B) -3
C) -1	D) 1

Answer & Explanation Answer: C) -1

Explanation:

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16 53788

Q:

Find the unit digit of the expression

$31^{2} + 32^{2} + 33^{2} + 34^{2} + 35^{2} + 36^{2} + 37^{2} + 38^{2} + 39^{2}$

A) 1	B) 4
C) 5	D) 9

Answer & Explanation Answer: C) 5

Explanation:

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Q:

A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

A) 12 pi cub.cm	B) 15 pi cub.cm
C) 16 pi cub.cm	D) 20 pi cub.cm

Answer & Explanation Answer: A) 12 pi cub.cm

Explanation:

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Filed Under: Volume and Surface Area

105 53363

Q:

If books bought at prices ranging from Rs. 200 to Rs. 350 are sold at prices ranging from Rs. 300 to Rs. 425, what is the greatest possible profit that might be made in selling eight books ?

A) 600	B) 1200
C) 1800	D) none of these

Answer & Explanation Answer: C) 1800

Explanation:

Least Cost Price = Rs. (200 * 8) = Rs. 1600.

Greatest Selling Price = Rs. (425 * 8) = Rs. 3400.

Required profit = Rs. (3400 - 1600) = Rs. 1800.

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412 53335

Q:

What is the place value of 6 in 64?

A) 6	B) 60
C) 64	D) 10

Answer & Explanation Answer: B) 60

Explanation:

We know that,

● Each digit has a fixed position called its place.

● Each digit has a value depending on its place called the place value of the digit.

● The face value of a digit for any place in the given number is the value of the digit itself

● Place value of a digit = (face value of the digit) × (value of the place).

Hence, the place value of 6 in 64 = 6 x 10 = 60.

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226 53214

Q:

Find out the wrong number in the following series ?

2880, 480, 92, 24, 8, 4, 4

A) 480	B) 92
C) 24	D) 4

Answer & Explanation Answer: B) 92

Explanation:

The given series of numbers follow the rule that,

2880/6 = 480
480/5 = 96
96/4 = 24
24/3 = 8
8/2 = 4
4/1 = 4

But 92 is not in the rule. It is the wrong number in the given series.

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Quantitative Aptitude - Arithmetic Ability Questions

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