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

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

A. 7:8:12

B. 6:8:13

C. 14:16:24

D. 7:9:12

Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

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

A. 63 L

B. 282 L

C. 303 L

D. 564 L

Correct Answer: Option B

Explanation:
Total parts = 11. Milk = [9 / (9+2)] × 345 = 282 L.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 6:9 and b:c = 9:4, then a:b:c = ?

A. 6:9:4

B. 6:10:4

C. 5:9:5

D. 12:18:8

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:4 ⇒ a:b:c = 6:9:4.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Find the mean proportional between 25 and 32.

A. 56

B. 28

C. 57

D. 31

Correct Answer: Option B

Explanation:
Mean proportional = √(25 × 32) = √(800) = 28.

This question belongs to: Maths Ratio and Proportion