If a:b = 5:8 and b:c = 8:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:8 and b:c = 8:5, then a:b:c = ?

A. 4:8:6

B. 5:9:5

C. 5:8:5

D. 10:16:10

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:8, b:c = 8:5 ⇒ a:b:c = 5:8:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 8:3 in a 249 L mixture. Quantity of milk?

A. 181 L

B. 68 L

C. 210 L

D. 362 L

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Correct Answer: Option A

Explanation:
Total parts = 11. Milk = [8 / (8+3)] × 249 = 181 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 7:5. After 9 years, the ratio becomes 9:6. Present age of A is?

A. 224 years

B. 112 years

C. 117 years

D. 109 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 5k. Then (7k + 9)/(5k + 9) = 9/6. Solving gives k ≈ 16, age of A = 7*16 = 112.

This question belongs to: Maths Ratio and Proportion

Question #3

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Two numbers are in the ratio 7:15 and their sum is 349. Find the numbers.

A. 210 and 450

B. 105 and 225

C. 115 and 199

D. 94 and 237

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Correct Answer: Option B

Explanation:
Numbers = 7k and 15k. 7k + 15k = 349 ⇒ k = 15. Thus, numbers are 105 and 225.

This question belongs to: Maths Ratio and Proportion

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