If a:b = 3:7 and b:c = 7:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:7 and b:c = 7:4, then a:b:c = ?

A. 3:8:4

B. 2:7:5

C. 6:14:8

D. 3:7:4

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:7, b:c = 7:4 ⇒ a:b:c = 3:7:4.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 8:3 in a 249 L mixture. Quantity of milk?

A. 362 L

B. 68 L

C. 210 L

D. 181 L

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Correct Answer: Option D

Explanation:
Total parts = 11. Milk = [8 / (8+3)] × 249 = 181 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 8:4 and b:c = 4:4, then a:b:c = ?

A. 7:4:5

B. 8:5:4

C. 16:8:8

D. 8:4:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 8:4, b:c = 4:4 ⇒ a:b:c = 8:4:4.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 12:9 and their sum is 368. Find the numbers.

A. 219 and 124

B. 408 and 306

C. 187 and 162

D. 204 and 153

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Correct Answer: Option D

Explanation:
Numbers = 12k and 9k. 12k + 9k = 368 ⇒ k = 17. Thus, numbers are 204 and 153.

This question belongs to: Maths Ratio and Proportion

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