If a:b = 4:10 and b:c = 10:6, then a:b:c = ? MCQ with Answer and Explanation
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Question #1
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If a:b = 5:8 and b:c = 8:12, then a:b:c = ?
Correct Answer: Option C
Explanation:
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Find the mean proportional between 25 and 32.
Correct Answer: Option D
Explanation:
Mean proportional = √(25 × 32) = √(800) = 28.
Mean proportional = √(25 × 32) = √(800) = 28.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 4:6. After 9 years, the ratio becomes 7:8. Present age of A is?
Correct Answer: Option A
Explanation:
Let ages 4k and 6k. Then (4k + 9)/(6k + 9) = 7/8. Solving gives k ≈ 22, age of A = 4*22 = 88.
Let ages 4k and 6k. Then (4k + 9)/(6k + 9) = 7/8. Solving gives k ≈ 22, age of A = 4*22 = 88.
This question belongs to:
Maths
Ratio and Proportion
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