If a:b = 3:9 and b:c = 9:12, then a:b:c = ? MCQ with Answer and Explanation

Question

Share Report Error

If a:b = 3:9 and b:c = 9:12, then a:b:c = ?

A. 6:18:24

B. 3:9:12

C. 3:10:12

D. 2:9:13

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:9, b:c = 9:12 ⇒ a:b:c = 3:9:12.

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

If a:b = 3:6 and b:c = 6:9, then a:b:c = ?

A. 2:6:10

B. 3:6:9

C. 3:7:9

D. 6:12:18

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:9 ⇒ a:b:c = 3:6:9.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 5:6:8

B. 5:5:8

C. 4:5:9

D. 10:10:16

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in the ratio 4:3 and their sum is 631. Find the numbers.

A. 380 and 258

B. 360 and 270

C. 720 and 540

D. 347 and 287

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Numbers = 4k and 3k. 4k + 3k = 631 ⇒ k = 90. Thus, numbers are 360 and 270.

This question belongs to: Maths Ratio and Proportion

Explore All Ratio and Proportion MCQs