If a:b = 7:5 and b:c = 5:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:5 and b:c = 5:12, then a:b:c = ?

A. 7:6:12

B. 14:10:24

C. 6:5:13

D. 7:5:12

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:5, b:c = 5:12 ⇒ a:b:c = 7:5:12.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 9:3 in a 463 L mixture. Quantity of milk?

A. 347 L

B. 116 L

C. 694 L

D. 384 L

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Correct Answer: Option A

Explanation:
Total parts = 12. Milk = [9 / (9+3)] × 463 = 347 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in the ratio 7:8 and their sum is 322. Find the numbers.

A. 294 and 336

B. 163 and 154

C. 147 and 168

D. 142 and 188

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Correct Answer: Option C

Explanation:
Numbers = 7k and 8k. 7k + 8k = 322 ⇒ k = 21. Thus, numbers are 147 and 168.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 7 and 9.

A. 10

B. 16

C. 14

D. 7

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Correct Answer: Option D

Explanation:
Mean proportional = √(7 × 9) = √(63) = 7.

This question belongs to: Maths Ratio and Proportion

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