If a:b = 8:7 and b:c = 7:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:7 and b:c = 7:12, then a:b:c = ?

A. 7:7:13

B. 8:7:12

C. 16:14:24

D. 8:8:12

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:7, b:c = 7:12 ⇒ a:b:c = 8:7:12.

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 36 and 21.

A. 27

B. 57

C. 54

D. 30

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Correct Answer: Option A

Explanation:
Mean proportional = √(36 × 21) = √(756) = 27.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 8:4 in a 505 L mixture. Quantity of milk?

A. 169 L

B. 336 L

C. 672 L

D. 379 L

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Correct Answer: Option B

Explanation:
Total parts = 12. Milk = [8 / (8+4)] × 505 = 336 L.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 14:7 and their sum is 130. Find the numbers.

A. 84 and 42

B. 110 and 31

C. 168 and 84

D. 70 and 52

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Correct Answer: Option A

Explanation:
Numbers = 14k and 7k. 14k + 7k = 130 ⇒ k = 6. Thus, numbers are 84 and 42.

This question belongs to: Maths Ratio and Proportion

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