If a:b = 5:8 and b:c = 8:12, then a:b:c = ? MCQ with Answer and Explanation

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

A. 5:8:12

B. 10:16:24

C. 5:9:12

D. 4:8:13

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 32 and 50.

A. 40

B. 80

C. 43

D. 82

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Correct Answer: Option A

Explanation:
Mean proportional = √(32 × 50) = √(1600) = 40.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 5:6 in a 503 L mixture. Quantity of milk?

A. 272 L

B. 228 L

C. 456 L

D. 275 L

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Correct Answer: Option B

Explanation:
Total parts = 11. Milk = [5 / (5+6)] × 503 = 228 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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

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