Find the mean proportional between 7 and 35. MCQ with Answer and Explanation

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Find the mean proportional between 7 and 35.

A. 15

B. 18

C. 42

D. 30

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(7 × 35) = √(245) = 15.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 8:7 and b:c = 7:4, then a:b:c = ?

A. 8:8:4

B. 7:7:5

C. 8:7:4

D. 16:14:8

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 8:7, b:c = 7:4 ⇒ a:b:c = 8:7:4.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 8:4 and b:c = 4:6, then a:b:c = ?

A. 8:5:6

B. 8:4:6

C. 7:4:7

D. 16:8:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:4, b:c = 4:6 ⇒ a:b:c = 8:4:6.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 9:5. Their difference is 112. What is their sum?

A. 210

B. 448

C. 420

D. 569

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Correct Answer: Option C

Explanation:
Numbers 9k, 5k. Difference |9-5|k = 112 ⇒ k = 28. Sum = (9+5)k ≈ 420.

This question belongs to: Maths Ratio and Proportion

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