If a:b = 4:9 and b:c = 9:11, then a:b:c = ? MCQ with Answer and Explanation

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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

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 12:10 and their sum is 753. Find the numbers.

A. 396 and 345

B. 429 and 320

C. 816 and 680

D. 408 and 340

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Correct Answer: Option D

Explanation:
Numbers = 12k and 10k. 12k + 10k = 753 ⇒ k = 34. Thus, numbers are 408 and 340.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:4 and b:c = 4:7, then a:b:c = ?

A. 4:8:14

B. 1:4:8

C. 2:5:7

D. 2:4:7

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:7 ⇒ a:b:c = 2:4:7.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 7:5 and b:c = 5:12, then a:b:c = ?

A. 6:5:13

B. 7:5:12

C. 7:6:12

D. 14:10:24

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:5, b:c = 5:12 ⇒ a:b:c = 7:5:12.

This question belongs to: Maths Ratio and Proportion

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