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

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

A. 5:7:7

B. 4:7:8

C. 5:8:7

D. 10:14:14

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 14:9 and their sum is 497. Find the numbers.

A. 307 and 170

B. 588 and 378

C. 294 and 189

D. 286 and 198

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Correct Answer: Option C

Explanation:
Numbers = 14k and 9k. 14k + 9k = 497 ⇒ k = 21. Thus, numbers are 294 and 189.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:5 and b:c = 5:7, then a:b:c = ?

A. 4:10:14

B. 1:5:8

C. 2:5:7

D. 2:6:7

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 2:5, b:c = 5:7 ⇒ a:b:c = 2:5:7.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:8 and b:c = 8:11, then a:b:c = ?

A. 4:16:22

B. 1:8:12

C. 2:9:11

D. 2:8:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:11 ⇒ a:b:c = 2:8:11.

This question belongs to: Maths Ratio and Proportion

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