If a:b = 2:8 and b:c = 8:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:8 and b:c = 8:11, then a:b:c = ?

A. 4:16:22

B. 2:8:11

C. 2:9:11

D. 1:8:12

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:8, b:c = 8:11 ⇒ a:b:c = 2:8:11.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 5:6 and their sum is 406. Find the numbers.

A. 360 and 432

B. 180 and 216

C. 160 and 225

D. 196 and 203

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Correct Answer: Option B

Explanation:
Numbers = 5k and 6k. 5k + 6k = 406 ⇒ k = 36. Thus, numbers are 180 and 216.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 4:5 in a 371 L mixture. Quantity of milk?

A. 207 L

B. 214 L

C. 164 L

D. 328 L

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Correct Answer: Option C

Explanation:
Total parts = 9. Milk = [4 / (4+5)] × 371 = 164 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 55 years

B. 60 years

C. 110 years

D. 50 years

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Correct Answer: Option A

Explanation:
Let ages 5k and 5k. Then (5k + 7)/(5k + 7) = 6/7. Solving gives k ≈ 11, age of A = 5*11 = 55.

This question belongs to: Maths Ratio and Proportion

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