Find the mean proportional between 28 and 49. MCQ with Answer and Explanation

Find the mean proportional between 28 and 49.

A. 40

B. 37

C. 74

D. 77

Answer: Option B

Mean proportional = √(28 × 49) = √(1372) = 37.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Milk and water are in ratio 5:6 in a 503 L mixture. Quantity of milk?

A. 272 L

B. 275 L

C. 456 L

D. 228 L

Correct Answer: Option D

Explanation:
Total parts = 11. Milk = [5 / (5+6)] × 503 = 228 L.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 5:8 and b:c = 8:12, then a:b:c = ?

A. 5:8:12

B. 4:8:13

C. 10:16:24

D. 5:9:12

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 6:9 and b:c = 9:10, then a:b:c = ?

A. 12:18:20

B. 6:9:10

C. 6:10:10

D. 5:9:11

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:10 ⇒ a:b:c = 6:9:10.

This question belongs to: Maths Ratio and Proportion