6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

Parimal has done 1/4th of a job in 10 days, Salim completes the rest of the job in 20 days. In how many days can they together do the job?

A) 8 days	B) 24 days
C) 12 days	D) 16 days

Answer & Explanation Answer: D) 16 days

Explanation:

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Filed Under: Time and Work
Exam Prep: Bank Exams

5 2102

Q:

There are 90 coins, comprising of 5 and 10 paisa coins. The value of all the coins is Rs. 7. How many 5 paisa coins are there?

A) 50	B) 45
C) 40	D) 35

Answer & Explanation Answer: C) 40

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams , CAT

3 2102

Q:

If ab = 21 and $\frac{{(a + b)}^{2}}{{(a - b)}^{2}} = \frac{25}{4}$ ,then the value of $a^{2} + b^{2} + 3 ab$

A) 115	B) 121
C) 125	D) 127

Answer & Explanation Answer: B) 121

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams

0 2101

Q:

A shopkeeper by selling 5 items, earns a profit equal to the selling price of 1 item. What is his profit percentage?

A) 20%	B) 25%
C) 16%	D) 22.5%

Answer & Explanation Answer: B) 25%

Explanation:

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Filed Under: Profit and Loss
Exam Prep: Bank Exams

4 2101

Q:

What is the LCM (least common multiple) of 57 and 93?

A) 1767	B) 1567
C) 1576	D) 1919

Answer & Explanation Answer: A) 1767

Explanation:

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Filed Under: HCF and LCM
Exam Prep: Bank Exams

6 2100

Q:

What should come in place of question mark (?) in the following question? (You do not have to calculate the exact value.)

(√80.997 - √25.001) × (√120.98 + √16.02) = ?

A) 20	B) 30
C) 40	D) 50

Answer & Explanation Answer:

Explanation:

Ans.
Approximating the values:
(√81 - √25) × (√121 + √16) = ?
(9 - 5) × (11 + 4) = ?
4 × 15 = ?
? = 60

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Filed Under: Simplification
Exam Prep: AIEEE , Bank Exams , GATE

0 2100

Q:

If a--b = 4 and ab = 45, find the value of $a^{3} - b^{3}$

A) 604	B) 370
C) 253	D) 199

Answer & Explanation Answer: A) 604

Explanation:

${(a - b)}^{2} = a^{2} + b^{2} - 2 ab \Rightarrow 16 = a^{2} + b^{2} - 90 \Rightarrow a^{2} + b^{2} = 106 a^{3} - b^{3} = (a - b) (a^{2} + b^{2} + ab) \Rightarrow a^{3} - b^{3} = 4 X (106 + 45) \Rightarrow a^{3} - b^{3} = 4 X 151 \Rightarrow a^{3} - b^{3} = 604$

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Filed Under: Simplification
Exam Prep: Bank Exams

0 2100

Q:

Find the radius of the circle if the area of its sector is 30.8 sq cm whose corresponding central angle is 72°?

A) 3.5 cm	B) 7 cm
C) 14 cm	D) 10.5 cm

Quantitative Aptitude - Arithmetic Ability Questions

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