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

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

A. 8:9:5

B. 8:8:5

C. 7:8:6

D. 16:16:10

Answer: Option B

Solution (By JKSSB Mock Tests)

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

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 6:4. After 9 years, the ratio becomes 9:6. Present age of A is?

A. 180 years

B. 90 years

C. 95 years

D. 83 years

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Correct Answer: Option B

Explanation:
Let ages 6k and 4k. Then (6k + 9)/(4k + 9) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 20 and 74.

A. 94

B. 76

C. 38

D. 41

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Correct Answer: Option C

Explanation:
Mean proportional = √(20 × 74) = √(1480) = 38.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 9:3 in a 463 L mixture. Quantity of milk?

A. 694 L

B. 347 L

C. 116 L

D. 384 L

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Correct Answer: Option B

Explanation:
Total parts = 12. Milk = [9 / (9+3)] × 463 = 347 L.

This question belongs to: Maths Ratio and Proportion

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