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. 2:5:7

B. 4:10:14

C. 1:5:8

D. 2:6:7

Answer: Option A

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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Question #1

If a:b = 6:7 and b:c = 7:10, then a:b:c = ?

A. 12:14:20

B. 6:8:10

C. 5:7:11

D. 6:7:10

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:7, b:c = 7:10 ⇒ a:b:c = 6:7:10.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 2:4 and b:c = 4:9, then a:b:c = ?

A. 2:4:9

B. 1:4:10

C. 4:8:18

D. 2:5:9

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:9 ⇒ a:b:c = 2:4:9.

This question belongs to: Maths Ratio and Proportion

Question #3

Milk and water are in ratio 7:2 in a 488 L mixture. Quantity of milk?

A. 399 L

B. 758 L

C. 109 L

D. 379 L

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Correct Answer: Option D

Explanation:
Total parts = 9. Milk = [7 / (7+2)] × 488 = 379 L.

This question belongs to: Maths Ratio and Proportion

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