If a:b = 3:7 and b:c = 7:4, then a:b:c = ? MCQ with Answer and Explanation

Question
If a:b = 3:7 and b:c = 7:4, then a:b:c = ?
A. 3:8:4
B. 6:14:8
C. 3:7:4
D. 2:7:5
Answer: Option C
Solution (By JKExamLibrary)
Combine ratios: a:b = 3:7, b:c = 7:4 ⇒ a:b:c = 3:7:4.
This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1
Two numbers are in the ratio 13:10 and their sum is 746. Find the numbers.
A. 416 and 320
B. 434 and 298
C. 403 and 338
D. 832 and 640
Discuss

Correct Answer: Option A

Explanation:
Numbers = 13k and 10k. 13k + 10k = 746 ⇒ k = 32. Thus, numbers are 416 and 320.
This question belongs to: Maths Ratio and Proportion
Question #2
If a:b = 3:6 and b:c = 6:9, then a:b:c = ?
A. 6:12:18
B. 2:6:10
C. 3:7:9
D. 3:6:9
Discuss

Correct Answer: Option D

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 #3
If a:b = 4:3 and b:c = 3:10, then a:b:c = ?
A. 4:4:10
B. 8:6:20
C. 3:3:11
D. 4:3:10
Discuss

Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:3, b:c = 3:10 ⇒ a:b:c = 4:3:10.
This question belongs to: Maths Ratio and Proportion
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