If a:b = 6:9 and b:c = 9:11, then a:b:c = ? MCQ with Answer and Explanation
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Question #1
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If a:b = 2:5 and b:c = 5:7, then a:b:c = ?
Correct Answer: Option B
Explanation:
Combine ratios: a:b = 2:5, b:c = 5:7 ⇒ a:b:c = 2:5:7.
Combine ratios: a:b = 2:5, b:c = 5:7 ⇒ a:b:c = 2:5:7.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Two numbers are in ratio 8:12. Their difference is 61. What is their sum?
Correct Answer: Option A
Explanation:
Numbers 8k, 12k. Difference |8-12|k = 61 ⇒ k = 15. Sum = (8+12)k ≈ 320.
Numbers 8k, 12k. Difference |8-12|k = 61 ⇒ k = 15. Sum = (8+12)k ≈ 320.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 6:4. After 5 years, the ratio becomes 9:7. Present age of A is?
Correct Answer: Option B
Explanation:
Let ages 6k and 4k. Then (6k + 5)/(4k + 5) = 9/7. Solving gives k ≈ 19, age of A = 6*19 = 114.
Let ages 6k and 4k. Then (6k + 5)/(4k + 5) = 9/7. Solving gives k ≈ 19, age of A = 6*19 = 114.
This question belongs to:
Maths
Ratio and Proportion
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