If a:b = 2:7 and b:c = 7:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:7 and b:c = 7:9, then a:b:c = ?

A. 1:7:10

B. 2:7:9

C. 2:8:9

D. 4:14:18

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:7, b:c = 7:9 ⇒ a:b:c = 2:7:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 3:10 and b:c = 10:11, then a:b:c = ?

A. 3:10:11

B. 2:10:12

C. 3:11:11

D. 6:20:22

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 3:10, b:c = 10:11 ⇒ a:b:c = 3:10:11.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 13:10 and their sum is 746. Find the numbers.

A. 832 and 640

B. 434 and 298

C. 403 and 338

D. 416 and 320

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Correct Answer: Option D

Explanation:
Numbers = 13k and 10k. 13k + 10k = 746 ⇒ k = 32. Thus, numbers are 416 and 320.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 303 L

B. 63 L

C. 282 L

D. 564 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

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