Find the mean proportional between 7 and 9. MCQ with Answer and Explanation

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Find the mean proportional between 7 and 9.

A. 7

B. 14

C. 10

D. 16

Answer: Option A

Solution (By JKSSB Mock Tests)

Mean proportional = √(7 × 9) = √(63) = 7.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 5:6 and b:c = 6:9, then a:b:c = ?

A. 10:12:18

B. 5:7:9

C. 4:6:10

D. 5:6:9

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:6, b:c = 6:9 ⇒ a:b:c = 5:6:9.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 15:6 and their sum is 278. Find the numbers.

A. 181 and 92

B. 195 and 78

C. 221 and 61

D. 390 and 156

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Correct Answer: Option B

Explanation:
Numbers = 15k and 6k. 15k + 6k = 278 ⇒ k = 13. Thus, numbers are 195 and 78.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 6:4. Their difference is 60. What is their sum?

A. 381

B. 350

C. 497

D. 175

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Correct Answer: Option B

Explanation:
Numbers 6k, 4k. Difference |6-4|k = 60 ⇒ k = 30. Sum = (6+4)k ≈ 350.

This question belongs to: Maths Ratio and Proportion

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