Find the mean proportional between 28 and 49. MCQ with Answer and Explanation

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Find the mean proportional between 28 and 49.

A. 77

B. 40

C. 37

D. 74

Answer: Option C

Solution (By JKSSB Mock Tests)

Mean proportional = √(28 × 49) = √(1372) = 37.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 7:7 and b:c = 7:7, then a:b:c = ?

A. 14:14:14

B. 7:8:7

C. 6:7:8

D. 7:7:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:7, b:c = 7:7 ⇒ a:b:c = 7:7:7.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 152 years

B. 68 years

C. 76 years

D. 81 years

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Correct Answer: Option C

Explanation:
Let ages 4k and 5k. Then (4k + 5)/(5k + 5) = 5/8. Solving gives k ≈ 19, age of A = 4*19 = 76.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 13:10 and their sum is 746. Find the numbers.

A. 832 and 640

B. 434 and 298

C. 403 and 338

D. 416 and 320

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Correct Answer: Option D

Explanation:
Numbers = 13k and 10k. 13k + 10k = 746 ⇒ k = 32. Thus, numbers are 416 and 320.

This question belongs to: Maths Ratio and Proportion

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