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

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If a:b = 3:4 and b:c = 4:5, then a:b:c = ?

A. 6:8:10

B. 2:4:6

C. 3:5:5

D. 3:4:5

Answer: Option D

Solution (By JKSSB Mock Tests)

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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Question #1

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Two numbers are in the ratio 11:3 and their sum is 121. Find the numbers.

A. 176 and 48

B. 73 and 38

C. 106 and 7

D. 88 and 24

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Correct Answer: Option D

Explanation:
Numbers = 11k and 3k. 11k + 3k = 121 ⇒ k = 8. Thus, numbers are 88 and 24.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 4:2 in a 505 L mixture. Quantity of milk?

A. 383 L

B. 672 L

C. 169 L

D. 336 L

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Correct Answer: Option D

Explanation:
Total parts = 6. Milk = [4 / (4+2)] × 505 = 336 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in ratio 7:4. Their difference is 73. What is their sum?

A. 636

B. 297

C. 734

D. 594

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Correct Answer: Option D

Explanation:
Numbers 7k, 4k. Difference |7-4|k = 73 ⇒ k = 24. Sum = (7+4)k ≈ 594.

This question belongs to: Maths Ratio and Proportion

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