If a:b = 2:5 and b:c = 5:7, then a:b:c = ? MCQ with Answer and Explanation

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

A. 2:6:7

B. 4:10:14

C. 2:5:7

D. 1:5:8

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 3:4:9

B. 4:4:8

C. 8:8:16

D. 4:5:8

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 12:11 and their sum is 394. Find the numbers.

A. 192 and 204

B. 408 and 374

C. 222 and 159

D. 204 and 187

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Correct Answer: Option D

Explanation:
Numbers = 12k and 11k. 12k + 11k = 394 ⇒ k = 17. Thus, numbers are 204 and 187.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 8:18:22

B. 4:10:11

C. 3:9:12

D. 4:9:11

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Correct Answer: Option D

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

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