If a:b = 5:9 and b:c = 9:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:9 and b:c = 9:10, then a:b:c = ?

A. 10:18:20

B. 5:10:10

C. 4:9:11

D. 5:9:10

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:9, b:c = 9:10 ⇒ a:b:c = 5:9:10.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 6:12. Their difference is 108. What is their sum?

A. 414

B. 447

C. 554

D. 207

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Correct Answer: Option A

Explanation:
Numbers 6k, 12k. Difference |6-12|k = 108 ⇒ k = 18. Sum = (6+12)k ≈ 414.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 4:10:8

B. 8:18:16

C. 4:9:8

D. 3:9:9

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 7:8:4

B. 6:7:5

C. 7:7:4

D. 14:14:8

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

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