6500+ Quantitative Aptitude Questions and Answers With Explanation

Q:

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is:-

A) 1:2	B) 2:3
C) 3:4	D) 3:5

Answer & Explanation Answer: B) 2:3

Explanation:

Let the ratio be x : y
Total boys = 16.4 X x
Total girls = 15.4 X y
Total number of students in class = 16.4x + 15.4y
The average age of all students is 15.8
The total age of boys is 15.8x
The total age of girls is 15.8y
16.4x + 15.4y = 15.8x + 15.8y
0.6 x = 0.4 y
x/y = 0.4/0.6 = 2/3

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Filed Under: Ratios and Proportions
Exam Prep: Bank Exams

2 1171

Q:

If the diameter of a sphere is 14 cm, then what is the surface area (in sq.cm) of the sphere?

A) 616	B) 308
C) 462	D) 636

Answer & Explanation Answer: A) 616

Explanation:

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Filed Under: Quantitative Aptitude - Arithmetic Ability
Exam Prep: AIEEE , Bank Exams , CAT

0 1171

Q:

A boy crosses a 300 metres wide road in 30 seconds. What is his speed (in km/hr)?

A) 18	B) 54
C) 36	D) 27

Answer & Explanation Answer: C) 36

Explanation:

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Filed Under: Time and Distance
Exam Prep: Bank Exams

5 1171

Q:

Fraction that lies between 2/5 and 4/9 is

A) 3/7	B) 3/4
C) 4/5	D) 1/2

Answer & Explanation Answer: A) 3/7

Explanation:

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Filed Under: Decimal Fractions
Exam Prep: Bank Exams

5 1171

Q:

Which of the following is NOT prime number?

A) 251	B) 571
C) 331	D) 341

Answer & Explanation Answer: D) 341

Explanation:

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Filed Under: Problems on Numbers
Exam Prep: Bank Exams

2 1170

Q:

A Lawn roller makes 20 revolutions in one hour. The radius it runs through 25 minutes is

A) 50π7	B) 150π7
C) 250π3	D) 50π3

Answer & Explanation Answer: D) 50π3

Explanation:

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Filed Under: Time and Distance
Exam Prep: Bank Exams , CAT

0 1170

Q:

4*(-0.1(5.5 + 8.5)) of 0.5 = ?

A) -2.8	B) -1.68
C) -1.28	D) -0.84

Answer & Explanation Answer: A) -2.8

Explanation:

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Filed Under: Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

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Q:

The distance between the points (7,7) and (k,-5) is 13. Find k?

A) -2	B) 4
C) -4	D) 2

Quantitative Aptitude - Arithmetic Ability Questions

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