If a:b = 6:3 and b:c = 3:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:3 and b:c = 3:12, then a:b:c = ?

A. 6:4:12

B. 12:6:24

C. 5:3:13

D. 6:3:12

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:3, b:c = 3:12 ⇒ a:b:c = 6:3:12.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 6:9 and b:c = 9:11, then a:b:c = ?

A. 6:10:11

B. 12:18:22

C. 6:9:11

D. 5:9:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:11 ⇒ a:b:c = 6:9:11.

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

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

A. 142 L

B. 227 L

C. 248 L

D. 454 L

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

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