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

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

A. 12:10:8

B. 6:6:4

C. 6:5:4

D. 5:5:5

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 13:6 and their sum is 485. Find the numbers.

A. 306 and 158

B. 325 and 150

C. 650 and 300

D. 342 and 131

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Correct Answer: Option B

Explanation:
Numbers = 13k and 6k. 13k + 6k = 485 ⇒ k = 25. Thus, numbers are 325 and 150.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 7:8. After 8 years, the ratio becomes 9:9. Present age of A is?

A. 280 years

B. 140 years

C. 135 years

D. 145 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 8k. Then (7k + 8)/(8k + 8) = 9/9. Solving gives k ≈ 20, age of A = 7*20 = 140.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 5:3 in a 366 L mixture. Quantity of milk?

A. 456 L

B. 138 L

C. 270 L

D. 228 L

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Correct Answer: Option D

Explanation:
Total parts = 8. Milk = [5 / (5+3)] × 366 = 228 L.

This question belongs to: Maths Ratio and Proportion

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