If a:b = 8:6 and b:c = 6:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:6 and b:c = 6:10, then a:b:c = ?

A. 8:6:10

B. 16:12:20

C. 7:6:11

D. 8:7:10

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:6, b:c = 6:10 ⇒ a:b:c = 8:6:10.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 456 L

B. 270 L

C. 228 L

D. 138 L

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 4:5. After 4 years, the ratio becomes 6:7. Present age of A is?

A. 120 years

B. 60 years

C. 55 years

D. 65 years

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Correct Answer: Option B

Explanation:
Let ages 4k and 5k. Then (4k + 4)/(5k + 4) = 6/7. Solving gives k ≈ 15, age of A = 4*15 = 60.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 6:5 and b:c = 5:11, then a:b:c = ?

A. 6:5:11

B. 12:10:22

C. 5:5:12

D. 6:6:11

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:11 ⇒ a:b:c = 6:5:11.

This question belongs to: Maths Ratio and Proportion

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