Find the mean proportional between 30 and 36. MCQ with Answer and Explanation

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Find the mean proportional between 30 and 36.

A. 35

B. 32

C. 66

D. 64

Answer: Option B

Solution (By JKSSB Mock Tests)

Mean proportional = √(30 × 36) = √(1080) = 32.

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 28 and 14.

A. 22

B. 42

C. 38

D. 19

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Correct Answer: Option D

Explanation:
Mean proportional = √(28 × 14) = √(392) = 19.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 10:10. Present age of A is?

A. 156 years

B. 322 years

C. 166 years

D. 161 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 10/10. Solving gives k ≈ 23, age of A = 7*23 = 161.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 5:7. After 4 years, the ratio becomes 8:8. Present age of A is?

A. 50 years

B. 90 years

C. 45 years

D. 42 years

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Correct Answer: Option C

Explanation:
Let ages 5k and 7k. Then (5k + 4)/(7k + 4) = 8/8. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

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