If a:b = 4:7 and b:c = 7:10, then a:b:c = ? MCQ with Answer and Explanation
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Question #1
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If a:b = 4:10 and b:c = 10:6, then a:b:c = ?
Correct Answer: Option B
Explanation:
Combine ratios: a:b = 4:10, b:c = 10:6 ⇒ a:b:c = 4:10:6.
Combine ratios: a:b = 4:10, b:c = 10:6 ⇒ a:b:c = 4:10:6.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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If a:b = 7:4 and b:c = 4:8, then a:b:c = ?
Correct Answer: Option D
Explanation:
Combine ratios: a:b = 7:4, b:c = 4:8 ⇒ a:b:c = 7:4:8.
Combine ratios: a:b = 7:4, b:c = 4:8 ⇒ a:b:c = 7:4:8.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 7:4. After 7 years, the ratio becomes 10:5. Present age of A is?
Correct Answer: Option A
Explanation:
Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.
Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.
This question belongs to:
Maths
Ratio and Proportion
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