If a:b = 4:5 and b:c = 5:8, then a:b:c = ? MCQ with Answer and Explanation

Question

Share Report Error

If a:b = 4:5 and b:c = 5:8, then a:b:c = ?

A. 4:5:8

B. 3:5:9

C. 8:10:16

D. 4:6:8

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:5, b:c = 5:8 ⇒ a:b:c = 4:5:8.

This question belongs to: Maths Ratio and Proportion

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Ratio and Proportion Questions

Question #1

Share Report

Two numbers are in ratio 11:6. Their difference is 42. What is their sum?

A. 527

B. 263

C. 560

D. 633

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Numbers 11k, 6k. Difference |11-6|k = 42 ⇒ k = 8. Sum = (11+6)k ≈ 527.

This question belongs to: Maths Ratio and Proportion

Question #2

Share Report

Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is?

A. 81 years

B. 170 years

C. 85 years

D. 90 years

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Let ages 5k and 7k. Then (5k + 12)/(7k + 12) = 7/10. Solving gives k ≈ 17, age of A = 5*17 = 85.

This question belongs to: Maths Ratio and Proportion

Question #3

Share Report

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

A. 4:8:10

B. 5:9:9

C. 10:16:18

D. 5:8:9

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

Explore All Ratio and Proportion MCQs