The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy? MCQ with Answer and Explanation

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The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy?

A. 24

B. 26

C. 28

D. 25.6 years

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum =4×16=64. Ratio sum=10. Oldest = (4/10)×64 =25.6.

This question belongs to: Maths Average

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Question #1

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Average of 10 numbers 680. If average of 6 is 675, average of remaining 4?

A. 687.5

B. 685

C. 690

D. 686

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Correct Answer: Option A

Explanation:
Sum10=6800. Sum6=4050. Remaining=2750. Average=687.5.

This question belongs to: Maths Average

Question #2

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The average of 6 numbers is 22. If one number is 10, find the average of the remaining 5 numbers.

A. 22.8

B. 24.4

C. 25

D. 23.6

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Correct Answer: Option B

Explanation:
Sum of 6 = 6×22=132. Sum of 5 =132-10=122. Average =122/5=24.4.

This question belongs to: Maths Average

Question #3

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Average of 10 numbers 2130. If average of 6 is 2125, average of remaining 4?

A. 2137.5

B. 2136

C. 2135

D. 2140

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Correct Answer: Option A

Explanation:
Sum10=21300. Sum6=12750. Remaining=8550. Average=2137.5.

This question belongs to: Maths Average

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