The average age of 5 children is 12. If parents average 40, average of all 7? MCQ with Answer and Explanation

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The average age of 5 children is 12. If parents average 40, average of all 7?

A. 22

B. 18

C. 25

D. 20

Answer: Option D

Solution (By JKExamLibrary)

Children total=60. Parents=80. Total=140. Average=20.

This question belongs to: Maths Average

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Question #1 Report Error

If average of 25 students is 50 and average of 15 is 60, average of remaining 10?

A. 30

B. 40

C. 35

D. 45

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Correct Answer: Option C

Explanation:
Sum25=1250. Sum15=900. Remaining sum=350. Average=35.

This question belongs to: Maths Average

Question #2 Report Error

Average of all three digit numbers is

A. 550

B. 600

C. 500

D. 549.5

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Correct Answer: Option D

Explanation:
(100+999)/2=549.5.

This question belongs to: Maths Average

Question #3 Report Error

The average of first 8 multiples of 5 is

A. 22.5

B. 25

C. 30

D. 20

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Correct Answer: Option A

Explanation:
5*(1+8)/2=22.5.

This question belongs to: Maths Average

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