If a:b = 6:7 and b:c = 7:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:7 and b:c = 7:12, then a:b:c = ?

A. 6:7:12

B. 6:8:12

C. 5:7:13

D. 12:14:24

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:7, b:c = 7:12 ⇒ a:b:c = 6:7:12.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 9:2 in a 345 L mixture. Quantity of milk?

A. 303 L

B. 564 L

C. 282 L

D. 63 L

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Correct Answer: Option C

Explanation:
Total parts = 11. Milk = [9 / (9+2)] × 345 = 282 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in the ratio 12:8 and their sum is 523. Find the numbers.

A. 312 and 208

B. 624 and 416

C. 294 and 220

D. 333 and 191

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Correct Answer: Option A

Explanation:
Numbers = 12k and 8k. 12k + 8k = 523 ⇒ k = 26. Thus, numbers are 312 and 208.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 4:6 in a 273 L mixture. Quantity of milk?

A. 218 L

B. 133 L

C. 164 L

D. 109 L

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Correct Answer: Option D

Explanation:
Total parts = 10. Milk = [4 / (4+6)] × 273 = 109 L.

This question belongs to: Maths Ratio and Proportion

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