The average age of father and son is 30. If father is 45, son's age? MCQ with Answer and Explanation

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The average age of father and son is 30. If father is 45, son's age?

A. 25

B. 15

C. 20

D. 10

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum =60. Son=60-45=15.

This question belongs to: Maths Average

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Question #1

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Average of 9 numbers 1490. If average of 6 is 1485, average of remaining 3?

A. 1498

B. 1495

C. 1500

D. 1505

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Correct Answer: Option C

Explanation:
Sum9=13410. Sum6=8910. Remaining=4500. Average=1500.

This question belongs to: Maths Average

Question #2

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Average of 10,20,30,40 is

A. 30

B. 20

C. 22.5

D. 25

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Correct Answer: Option D

Explanation:
100/4=25.

This question belongs to: Maths Average

Question #3

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Average of 9 consecutive even numbers is 30. Smallest?

A. 24

B. 26

C. 20

D. 22

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Correct Answer: Option D

Explanation:
Middle 5th=30. Smallest=30-8=22.

This question belongs to: Maths Average

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