Find the mean proportional between 10 and 72. MCQ with Answer and Explanation

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Find the mean proportional between 10 and 72.

A. 26

B. 82

C. 29

D. 52

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(10 × 72) = √(720) = 26.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 3:3 and b:c = 3:6, then a:b:c = ?

A. 2:3:7

B. 3:4:6

C. 6:6:12

D. 3:3:6

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:3, b:c = 3:6 ⇒ a:b:c = 3:3:6.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 5:4 in a 536 L mixture. Quantity of milk?

A. 594 L

B. 297 L

C. 239 L

D. 329 L

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Correct Answer: Option B

Explanation:
Total parts = 9. Milk = [5 / (5+4)] × 536 = 297 L.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:8. After 10 years, the ratio becomes 9:10. Present age of A is?

A. 152 years

B. 143 years

C. 294 years

D. 147 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 8k. Then (7k + 10)/(8k + 10) = 9/10. Solving gives k ≈ 21, age of A = 7*21 = 147.

This question belongs to: Maths Ratio and Proportion

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