If a:b = 5:9 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 = 5:3 and b:c = 3:4, then a:b:c = ?
Correct Answer: Option C
Explanation:
Combine ratios: a:b = 5:3, b:c = 3:4 ⇒ a:b:c = 5:3:4.
Combine ratios: a:b = 5:3, b:c = 3:4 ⇒ a:b:c = 5:3:4.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 3:6. After 11 years, the ratio becomes 5:9. Present age of A is?
Correct Answer: Option A
Explanation:
Let ages 3k and 6k. Then (3k + 11)/(6k + 11) = 5/9. Solving gives k ≈ 19, age of A = 3*19 = 57.
Let ages 3k and 6k. Then (3k + 11)/(6k + 11) = 5/9. Solving gives k ≈ 19, age of A = 3*19 = 57.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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If a:b = 5:9 and b:c = 9:10, then a:b:c = ?
Correct Answer: Option D
Explanation:
Combine ratios: a:b = 5:9, b:c = 9:10 ⇒ a:b:c = 5:9:10.
Combine ratios: a:b = 5:9, b:c = 9:10 ⇒ a:b:c = 5:9:10.
This question belongs to:
Maths
Ratio and Proportion
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