If a:b = 3:4 and b:c = 4:5, then a:b:c = ? MCQ with Answer and Explanation

Question
If a:b = 3:4 and b:c = 4:5, then a:b:c = ?
A. 3:5:5
B. 6:8:10
C. 2:4:6
D. 3:4:5
Answer: Option D
Solution (By JKExamLibrary)
Combine ratios: a:b = 3:4, b:c = 4:5 ⇒ a:b:c = 3:4:5.
This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1
If a:b = 5:9 and b:c = 9:10, then a:b:c = ?
A. 5:9:10
B. 4:9:11
C. 5:10:10
D. 10:18:20
Discuss

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:9, b:c = 9:10 ⇒ a:b:c = 5:9:10.
This question belongs to: Maths Ratio and Proportion
Question #2
Find the mean proportional between 24 and 32.
A. 56
B. 54
C. 27
D. 30
Discuss

Correct Answer: Option C

Explanation:
Mean proportional = √(24 × 32) = √(768) = 27.
This question belongs to: Maths Ratio and Proportion
Question #3
Two numbers are in the ratio 3:14 and their sum is 614. Find the numbers.
A. 118 and 488
B. 99 and 524
C. 108 and 504
D. 216 and 1008
Discuss

Correct Answer: Option C

Explanation:
Numbers = 3k and 14k. 3k + 14k = 614 ⇒ k = 36. Thus, numbers are 108 and 504.
This question belongs to: Maths Ratio and Proportion
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