Find the mean proportional between 17 and 42. MCQ with Answer and Explanation

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Find the mean proportional between 17 and 42.

A. 59

B. 29

C. 26

D. 52

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean proportional = √(17 × 42) = √(714) = 26.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is?

A. 140 years

B. 135 years

C. 280 years

D. 145 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 8)/(8k + 8) = 9/9. Solving gives k ≈ 20, age of A = 7*20 = 140.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 31 and 33.

A. 64

B. 34

C. 62

D. 31

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Correct Answer: Option D

Explanation:
Mean proportional = √(31 × 33) = √(1023) = 31.

This question belongs to: Maths Ratio and Proportion

Question #3

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Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 8:9. Present age of A is?

A. 126 years

B. 131 years

C. 119 years

D. 252 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

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