6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

The lengths of the two diagonals of a rhombus are 5 cm and 12 cm. Find its area (in $c m^{2}$ )

A) 30	B) 15
C) 60	D) 45

Answer & Explanation Answer: A) 30

Explanation:

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Filed Under: Quantitative Aptitude - Arithmetic Ability

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Q:

Twenty one times of a positive number is less than its square by 100. The value of the positive number is

A) 25	B) 26
C) 42	D) 41

Answer & Explanation Answer: A) 25

Explanation:

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Filed Under: Problems on Numbers
Exam Prep: Bank Exams

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Q:

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

A) 2	B) 24
C) 26	D) 28

Answer & Explanation Answer: D) 28

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Filed Under: Average
Exam Prep: Bank Exams

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Q:

What is the compound interest on Rs. 48,000 for 2 years at 20% p.a., if interest is compounded annually?

A) Rs. 69,120	B) Rs. 21,120
C) Rs. 76,800	D) Rs. 72,000

Answer & Explanation Answer: B) Rs. 21,120

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Filed Under: Compound Interest
Exam Prep: Bank Exams , CAT

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Q:

$If a - b = 6 and ab = 16, then a^{3} - b^{3} is$

A) 504	B) 702
C) 728	D) 511

Answer & Explanation Answer: A) 504

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Filed Under: Simplification
Exam Prep: Bank Exams

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Q:

Given that the polynomial $(x^{2} + ax + b)$ leaves that same remainder when by (x –1) or (x + 1) What are the values of a and b respectively?

A) 4 and 0	B) 0 and 3
C) 3 and 0	D) 0 and any interger

Answer & Explanation Answer: D) 0 and any interger

Explanation:

Since x^2+ ax + b when divided by x-1 or x+1 leaves the same remainder

So on putting x=1 and x=-1 we get the same value

1+a+b = 1-a+b

2a=0

a=0

here b can take any value as it will always get cancelled out

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Filed Under: Numbers
Exam Prep: Bank Exams

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Q:

In an army selection process, the ratio of selected to unselected was 3:1. If 60 less had applied and 30 less selected, the ratio of selected to unselected would have been 5:1. How many candidates had applied for the process?

A) 240	B) 480
C) 120	D) 720

Answer & Explanation Answer: A) 240

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Filed Under: Ratios and Proportions
Exam Prep: Bank Exams

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Q:

Find out the odd word/letters/number/number pair from the given alternatives.

A) Tetanus	B) Syphilis
C) Plague	D) Malaria

Quantitative Aptitude - Arithmetic Ability Questions

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