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

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

A. 5:6:4

B. 10:10:8

C. 5:5:4

D. 4:5:5

Answer: Option C

Solution (By JKExamLibrary)

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

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

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

A. 6:8:10

B. 3:4:5

C. 2:4:6

D. 3:5:5

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:4, b:c = 4:5 ⇒ a:b:c = 3:4:5.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Milk and water are in ratio 6:2 in a 184 L mixture. Quantity of milk?

A. 46 L

B. 138 L

C. 276 L

D. 159 L

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Correct Answer: Option B

Explanation:
Total parts = 8. Milk = [6 / (6+2)] × 184 = 138 L.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 3:8. After 10 years, the ratio becomes 4:10. Present age of A is?

A. 44 years

B. 51 years

C. 56 years

D. 102 years

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Correct Answer: Option B

Explanation:
Let ages 3k and 8k. Then (3k + 10)/(8k + 10) = 4/10. Solving gives k ≈ 17, age of A = 3*17 = 51.

This question belongs to: Maths Ratio and Proportion

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