If a:b = 3:4 and b:c = 4:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:4 and b:c = 4:6, then a:b:c = ?

A. 2:4:7

B. 3:5:6

C. 6:8:12

D. 3:4:6

Answer: Option D

Solution (By JKExamLibrary)

Combine ratios: a:b = 3:4, b:c = 4:6 ⇒ a:b:c = 3:4:6.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

If a:b = 8:6 and b:c = 6:12, then a:b:c = ?

A. 16:12:24

B. 8:7:12

C. 8:6:12

D. 7:6:13

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 8:6, b:c = 6:12 ⇒ a:b:c = 8:6:12.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 5:5 and b:c = 5:12, then a:b:c = ?

A. 5:5:12

B. 10:10:24

C. 4:5:13

D. 5:6:12

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:5, b:c = 5:12 ⇒ a:b:c = 5:5:12.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Two numbers are in ratio 7:5. Their difference is 102. What is their sum?

A. 546

B. 647

C. 252

D. 504

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Correct Answer: Option D

Explanation:
Numbers 7k, 5k. Difference |7-5|k = 102 ⇒ k = 51. Sum = (7+5)k ≈ 504.

This question belongs to: Maths Ratio and Proportion

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