If a:b = 4:9 and b:c = 9:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:9 and b:c = 9:8, then a:b:c = ?

A. 3:9:9

B. 8:18:16

C. 4:9:8

D. 4:10:8

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:9, b:c = 9:8 ⇒ a:b:c = 4:9:8.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 12:16:16

B. 6:9:8

C. 5:8:9

D. 6:8:8

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 16 and 39.

A. 24

B. 55

C. 27

D. 48

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Correct Answer: Option A

Explanation:
Mean proportional = √(16 × 39) = √(624) = 24.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 15:9 and their sum is 542. Find the numbers.

A. 320 and 205

B. 342 and 171

C. 660 and 396

D. 330 and 198

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Correct Answer: Option D

Explanation:
Numbers = 15k and 9k. 15k + 9k = 542 ⇒ k = 22. Thus, numbers are 330 and 198.

This question belongs to: Maths Ratio and Proportion

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