If a:b = 4:5 and b:c = 5:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:5 and b:c = 5:9, then a:b:c = ?

A. 8:10:18

B. 4:6:9

C. 3:5:10

D. 4:5:9

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:5, b:c = 5:9 ⇒ a:b:c = 4:5:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 3:9 and b:c = 9:12, then a:b:c = ?

A. 2:9:13

B. 3:9:12

C. 3:10:12

D. 6:18:24

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:9, b:c = 9:12 ⇒ a:b:c = 3:9:12.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 2:4 and b:c = 4:6, then a:b:c = ?

A. 2:4:6

B. 2:5:6

C. 4:8:12

D. 1:4:7

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:6 ⇒ a:b:c = 2:4:6.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:3 and b:c = 3:11, then a:b:c = ?

A. 1:3:12

B. 2:3:11

C. 4:6:22

D. 2:4:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:3, b:c = 3:11 ⇒ a:b:c = 2:3:11.

This question belongs to: Maths Ratio and Proportion

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