If a:b = 5:8 and b:c = 8:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:8 and b:c = 8:9, then a:b:c = ?

A. 5:8:9

B. 4:8:10

C. 10:16:18

D. 5:9:9

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:8, b:c = 8:9 ⇒ a:b:c = 5:8:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:6 in a 413 L mixture. Quantity of milk?

A. 207 L

B. 206 L

C. 412 L

D. 245 L

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Correct Answer: Option B

Explanation:
Total parts = 12. Milk = [6 / (6+6)] × 413 = 206 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 3:7 and b:c = 7:11, then a:b:c = ?

A. 3:8:11

B. 6:14:22

C. 2:7:12

D. 3:7:11

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 3:7, b:c = 7:11 ⇒ a:b:c = 3:7:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 3:10 and b:c = 10:8, then a:b:c = ?

A. 6:20:16

B. 3:10:8

C. 3:11:8

D. 2:10:9

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:10, b:c = 10:8 ⇒ a:b:c = 3:10:8.

This question belongs to: Maths Ratio and Proportion

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