Find the mean proportional between 14 and 77. MCQ with Answer and Explanation

Find the mean proportional between 14 and 77.

A. 32

B. 64

C. 35

D. 91

Answer: Option A

Mean proportional = √(14 × 77) = √(1078) = 32.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 7:12. Their difference is 133. What is their sum?

A. 507

B. 199

C. 399

D. 434

Correct Answer: Option C

Explanation:
Numbers 7k, 12k. Difference |7-12|k = 133 ⇒ k = 26. Sum = (7+12)k ≈ 399.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 10 and 72.

A. 26

B. 52

C. 82

D. 29

Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Two numbers are in the ratio 13:4 and their sum is 771. Find the numbers.

A. 1170 and 360

B. 609 and 170

C. 578 and 197

D. 585 and 180

Correct Answer: Option D

Explanation:
Numbers = 13k and 4k. 13k + 4k = 771 ⇒ k = 45. Thus, numbers are 585 and 180.

This question belongs to: Maths Ratio and Proportion