Find the mean proportional between 20 and 36. MCQ with Answer and Explanation

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Find the mean proportional between 20 and 36.

A. 26

B. 29

C. 52

D. 56

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(20 × 36) = √(720) = 26.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 11 and 45.

A. 56

B. 44

C. 25

D. 22

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Correct Answer: Option D

Explanation:
Mean proportional = √(11 × 45) = √(495) = 22.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 9:3 in a 408 L mixture. Quantity of milk?

A. 612 L

B. 349 L

C. 306 L

D. 102 L

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Correct Answer: Option C

Explanation:
Total parts = 12. Milk = [9 / (9+3)] × 408 = 306 L.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:5. After 11 years, the ratio becomes 8:7. Present age of A is?

A. 210 years

B. 105 years

C. 102 years

D. 110 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 5k. Then (7k + 11)/(5k + 11) = 8/7. Solving gives k ≈ 15, age of A = 7*15 = 105.

This question belongs to: Maths Ratio and Proportion

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