If a:b = 5:9 and b:c = 9:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:9 and b:c = 9:7, then a:b:c = ?

A. 5:9:7

B. 4:9:8

C. 5:10:7

D. 10:18:14

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:9, b:c = 9:7 ⇒ a:b:c = 5:9:7.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 3:7 and b:c = 7:9, then a:b:c = ?

A. 3:8:9

B. 2:7:10

C. 3:7:9

D. 6:14:18

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 3:7, b:c = 7:9 ⇒ a:b:c = 3:7:9.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 4:9 and b:c = 9:11, then a:b:c = ?

A. 4:9:11

B. 8:18:22

C. 4:10:11

D. 3:9:12

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 4:9, b:c = 9:11 ⇒ a:b:c = 4:9:11.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:6 and b:c = 6:12, then a:b:c = ?

A. 4:12:24

B. 1:6:13

C. 2:7:12

D. 2:6:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:6, b:c = 6:12 ⇒ a:b:c = 2:6:12.

This question belongs to: Maths Ratio and Proportion

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