If a:b = 3:10 and b:c = 10:8, then a:b:c = ? MCQ with Answer and Explanation
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Question #1
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If a:b = 7:8 and b:c = 8:9, then a:b:c = ?
Correct Answer: Option B
Explanation:
Combine ratios: a:b = 7:8, b:c = 8:9 ⇒ a:b:c = 7:8:9.
Combine ratios: a:b = 7:8, b:c = 8:9 ⇒ a:b:c = 7:8:9.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 5:4. After 4 years, the ratio becomes 6:7. Present age of A is?
Correct Answer: Option D
Explanation:
Let ages 5k and 4k. Then (5k + 4)/(4k + 4) = 6/7. Solving gives k ≈ 9, age of A = 5*9 = 45.
Let ages 5k and 4k. Then (5k + 4)/(4k + 4) = 6/7. Solving gives k ≈ 9, age of A = 5*9 = 45.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Milk and water are in ratio 9:4 in a 207 L mixture. Quantity of milk?
Correct Answer: Option C
Explanation:
Total parts = 13. Milk = [9 / (9+4)] × 207 = 143 L.
Total parts = 13. Milk = [9 / (9+4)] × 207 = 143 L.
This question belongs to:
Maths
Ratio and Proportion
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