The average age of 6 children is 10 years. If the age of one child is 8, find the average age of the remaining 5. MCQ with Answer and Explanation

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The average age of 6 children is 10 years. If the age of one child is 8, find the average age of the remaining 5.

A. 9.6

B. 10.4

C. 11

D. 10

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum=6×10=60. Remaining sum=60-8=52. Avg=52/5=10.4.

This question belongs to: Maths Average

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Question #1

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The average of 3 numbers is 15. If each number is multiplied by 2, what is the new average?

A. 45

B. 60

C. 30

D. 15

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Correct Answer: Option C

Explanation:
New average =15×2=30.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 650. If average of 5 is 645, average of remaining 3?

A. 660

B. 657

C. 655

D. 658.33

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Correct Answer: Option D

Explanation:
Sum8=5200. Sum5=3225. Remaining=1975. Average≈658.33.

This question belongs to: Maths Average

Question #3

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The average weight of 20 students is 50 kg. If the teacher's weight is added, the average becomes 52 kg. Find the teacher's weight.

A. 90 kg

B. 94 kg

C. 92 kg

D. 88 kg

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Correct Answer: Option C

Explanation:
Total weight of 20 = 20×50=1000. Total of 21 =21×52=1092. Teacher's weight =1092-1000=92.

This question belongs to: Maths Average

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