If a:b = 8:5 and b:c = 5:9, then a:b:c = ? MCQ with Answer and Explanation

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

A. 8:5:9

B. 7:5:10

C. 16:10:18

D. 8:6:9

Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 10:12. Their difference is 61. What is their sum?

A. 238

B. 279

C. 99

D. 198

Correct Answer: Option D

Explanation:
Numbers 10k, 12k. Difference |10-12|k = 61 ⇒ k = 30. Sum = (10+12)k ≈ 198.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Two numbers are in the ratio 12:9 and their sum is 569. Find the numbers.

A. 324 and 243

B. 317 and 258

C. 648 and 486

D. 341 and 215

Correct Answer: Option A

Explanation:
Numbers = 12k and 9k. 12k + 9k = 569 ⇒ k = 27. Thus, numbers are 324 and 243.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 5:6 and b:c = 6:9, then a:b:c = ?

A. 5:7:9

B. 4:6:10

C. 10:12:18

D. 5:6:9

Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:6, b:c = 6:9 ⇒ a:b:c = 5:6:9.

This question belongs to: Maths Ratio and Proportion