If a:b = 8:7 and b:c = 7:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:7 and b:c = 7:6, then a:b:c = ?

A. 8:7:6

B. 8:8:6

C. 7:7:7

D. 16:14:12

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:7, b:c = 7:6 ⇒ a:b:c = 8:7:6.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 7:8. After 10 years, the ratio becomes 9:10. Present age of A is?

A. 147 years

B. 143 years

C. 294 years

D. 152 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 10)/(8k + 10) = 9/10. Solving gives k ≈ 21, age of A = 7*21 = 147.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 22 and 16.

A. 18

B. 38

C. 36

D. 21

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Correct Answer: Option A

Explanation:
Mean proportional = √(22 × 16) = √(352) = 18.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 6:2 in a 401 L mixture. Quantity of milk?

A. 300 L

B. 345 L

C. 101 L

D. 600 L

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Correct Answer: Option A

Explanation:
Total parts = 8. Milk = [6 / (6+2)] × 401 = 300 L.

This question belongs to: Maths Ratio and Proportion

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