Find the mean proportional between 15 and 13. MCQ with Answer and Explanation

Find the mean proportional between 15 and 13.

A. 13

B. 26

C. 16

D. 28

Answer: Option A

Mean proportional = √(15 × 13) = √(195) = 13.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 4:9. Their difference is 73. What is their sum?

A. 557

B. 520

C. 260

D. 656

Correct Answer: Option B

Explanation:
Numbers 4k, 9k. Difference |4-9|k = 73 ⇒ k = 14. Sum = (4+9)k ≈ 520.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 28 and 14.

A. 22

B. 42

C. 19

D. 38

Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Two numbers are in ratio 8:11. Their difference is 86. What is their sum?

A. 304

B. 152

C. 427

D. 344

Correct Answer: Option A

Explanation:
Numbers 8k, 11k. Difference |8-11|k = 86 ⇒ k = 28. Sum = (8+11)k ≈ 304.

This question belongs to: Maths Ratio and Proportion