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

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

A. 4:14:18

B. 2:7:9

C. 2:8:9

D. 1:7:10

Answer: Option B

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 Report Error

Milk and water are in ratio 4:3 in a 517 L mixture. Quantity of milk?

A. 295 L

B. 334 L

C. 590 L

D. 222 L

Correct Answer: Option A

Explanation:
Total parts = 7. Milk = [4 / (4+3)] × 517 = 295 L.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 4 and 32.

A. 36

B. 14

C. 11

D. 22

Correct Answer: Option C

Explanation:
Mean proportional = √(4 × 32) = √(128) = 11.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 8:5 and b:c = 5:9, then a:b:c = ?

A. 8:5:9

B. 8:6:9

C. 16:10:18

D. 7:5:10

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 8:5, b:c = 5:9 ⇒ a:b:c = 8:5:9.

This question belongs to: Maths Ratio and Proportion