Find the mean proportional between 18 and 55. MCQ with Answer and Explanation

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Find the mean proportional between 18 and 55.

A. 31

B. 73

C. 34

D. 62

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(18 × 55) = √(990) = 31.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 5:3 and b:c = 3:7, then a:b:c = ?

A. 10:6:14

B. 4:3:8

C. 5:4:7

D. 5:3:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:3, b:c = 3:7 ⇒ a:b:c = 5:3:7.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 12:8 and their sum is 523. Find the numbers.

A. 333 and 191

B. 312 and 208

C. 294 and 220

D. 624 and 416

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Correct Answer: Option B

Explanation:
Numbers = 12k and 8k. 12k + 8k = 523 ⇒ k = 26. Thus, numbers are 312 and 208.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 4:5. After 4 years, the ratio becomes 6:7. Present age of A is?

A. 120 years

B. 60 years

C. 65 years

D. 55 years

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Correct Answer: Option B

Explanation:
Let ages 4k and 5k. Then (4k + 4)/(5k + 4) = 6/7. Solving gives k ≈ 15, age of A = 4*15 = 60.

This question belongs to: Maths Ratio and Proportion

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