If a:b = 5:3 and b:c = 3:7, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 5:3 and b:c = 3:7, then a:b:c = ?

A. 4:3:8

B. 10:6:14

C. 5:4:7

D. 5:3:7

Answer: Option D

Combine ratios: a:b = 5:3, b:c = 3:7 ⇒ a:b:c = 5:3:7.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Milk and water are in ratio 3:7 in a 391 L mixture. Quantity of milk?

A. 153 L

B. 274 L

C. 117 L

D. 234 L

Correct Answer: Option C

Explanation:
Total parts = 10. Milk = [3 / (3+7)] × 391 = 117 L.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

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

A. 12:18:12

B. 6:9:6

C. 6:10:6

D. 5:9:7

Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

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

Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion