If a:b = 4:6 and b:c = 6:11, 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 = 8:12, then a:b:c = ?
Correct Answer: Option D
Explanation:
Combine ratios: a:b = 7:8, b:c = 8:12 ⇒ a:b:c = 7:8:12.
Combine ratios: a:b = 7:8, b:c = 8:12 ⇒ a:b:c = 7:8:12.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 6:7. After 6 years, the ratio becomes 7:8. Present age of A is?
Correct Answer: Option B
Explanation:
Let ages 6k and 7k. Then (6k + 6)/(7k + 6) = 7/8. Solving gives k ≈ 9, age of A = 6*9 = 54.
Let ages 6k and 7k. Then (6k + 6)/(7k + 6) = 7/8. Solving gives k ≈ 9, age of A = 6*9 = 54.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 7:11. Present age of A is?
Correct Answer: Option C
Explanation:
Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 7/11. Solving gives k ≈ 23, age of A = 4*23 = 92.
Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 7/11. Solving gives k ≈ 23, age of A = 4*23 = 92.
This question belongs to:
Maths
Ratio and Proportion
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