If a:b = 2:8 and b:c = 8:5, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 2:8 and b:c = 8:5, then a:b:c = ?

A. 4:16:10

B. 2:9:5

C. 1:8:6

D. 2:8:5

Answer: Option D

Combine ratios: a:b = 2:8, b:c = 8:5 ⇒ a:b:c = 2:8:5.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 6:12. Their difference is 91. What is their sum?

A. 449

B. 396

C. 198

D. 533

Correct Answer: Option B

Explanation:
Numbers 6k, 12k. Difference |6-12|k = 91 ⇒ k = 15. Sum = (6+12)k ≈ 396.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 4:5 and b:c = 5:6, then a:b:c = ?

A. 8:10:12

B. 4:6:6

C. 4:5:6

D. 3:5:7

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:5, b:c = 5:6 ⇒ a:b:c = 4:5:6.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

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

A. 5:9:7

B. 12:18:12

C. 6:9:6

D. 6:10:6

Correct Answer: Option C

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