If a:b = 6:4 and b:c = 4:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:4 and b:c = 4:5, then a:b:c = ?

A. 6:4:5

B. 12:8:10

C. 6:5:5

D. 5:4:6

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:4, b:c = 4:5 ⇒ a:b:c = 6:4:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 14:12 and their sum is 772. Find the numbers.

A. 389 and 367

B. 421 and 329

C. 406 and 348

D. 812 and 696

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Correct Answer: Option C

Explanation:
Numbers = 14k and 12k. 14k + 12k = 772 ⇒ k = 29. Thus, numbers are 406 and 348.

This question belongs to: Maths Ratio and Proportion

Question #2

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Two numbers are in ratio 6:8. Their difference is 69. What is their sum?

A. 112

B. 283

C. 368

D. 224

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Correct Answer: Option D

Explanation:
Numbers 6k, 8k. Difference |6-8|k = 69 ⇒ k = 34. Sum = (6+8)k ≈ 224.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 720 and 540

B. 360 and 270

C. 380 and 258

D. 347 and 287

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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

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