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. 1:5:8

B. 2:6:7

C. 2:5:7

D. 4:10:14

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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Question #1

If a:b = 5:8 and b:c = 8:12, then a:b:c = ?

A. 10:16:24

B. 5:8:12

C. 4:8:13

D. 5:9:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 8:6 in a 248 L mixture. Quantity of milk?

A. 175 L

B. 282 L

C. 107 L

D. 141 L

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Correct Answer: Option D

Explanation:
Total parts = 14. Milk = [8 / (8+6)] × 248 = 141 L.

This question belongs to: Maths Ratio and Proportion

Question #3

Milk and water are in ratio 9:6 in a 275 L mixture. Quantity of milk?

A. 110 L

B. 165 L

C. 186 L

D. 330 L

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Correct Answer: Option B

Explanation:
Total parts = 15. Milk = [9 / (9+6)] × 275 = 165 L.

This question belongs to: Maths Ratio and Proportion

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