Find the mean proportional between 11 and 61. MCQ with Answer and Explanation
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Question #1
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If a:b = 2:3 and b:c = 3:9, then a:b:c = ?
Correct Answer: Option A
Explanation:
Combine ratios: a:b = 2:3, b:c = 3:9 ⇒ a:b:c = 2:3:9.
Combine ratios: a:b = 2:3, b:c = 3:9 ⇒ a:b:c = 2:3:9.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Find the mean proportional between 15 and 43.
Correct Answer: Option C
Explanation:
Mean proportional = √(15 × 43) = √(645) = 25.
Mean proportional = √(15 × 43) = √(645) = 25.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is?
Correct Answer: Option A
Explanation:
Let ages 4k and 7k. Then (4k + 11)/(7k + 11) = 5/8. Solving gives k ≈ 10, age of A = 4*10 = 40.
Let ages 4k and 7k. Then (4k + 11)/(7k + 11) = 5/8. Solving gives k ≈ 10, age of A = 4*10 = 40.
This question belongs to:
Maths
Ratio and Proportion
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