If a:b = 3:9 and b:c = 9:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:9 and b:c = 9:10, then a:b:c = ?

A. 3:9:10

B. 2:9:11

C. 3:10:10

D. 6:18:20

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:9, b:c = 9:10 ⇒ a:b:c = 3:9:10.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 8:3 in a 249 L mixture. Quantity of milk?

A. 362 L

B. 181 L

C. 68 L

D. 210 L

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Correct Answer: Option B

Explanation:
Total parts = 11. Milk = [8 / (8+3)] × 249 = 181 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 1:4:5

B. 2:4:4

C. 2:5:4

D. 4:8:8

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 8:5 in a 369 L mixture. Quantity of milk?

A. 454 L

B. 142 L

C. 248 L

D. 227 L

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Correct Answer: Option D

Explanation:
Total parts = 13. Milk = [8 / (8+5)] × 369 = 227 L.

This question belongs to: Maths Ratio and Proportion

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