Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is? MCQ with Answer and Explanation
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Question #1
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Find the mean proportional between 11 and 38.
Correct Answer: Option A
Explanation:
Mean proportional = √(11 × 38) = √(418) = 20.
Mean proportional = √(11 × 38) = √(418) = 20.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Two numbers are in ratio 7:12. Their difference is 101. What is their sum?
Correct Answer: Option C
Explanation:
Numbers 7k, 12k. Difference |7-12|k = 101 ⇒ k = 20. Sum = (7+12)k ≈ 304.
Numbers 7k, 12k. Difference |7-12|k = 101 ⇒ k = 20. Sum = (7+12)k ≈ 304.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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If a:b = 6:8 and b:c = 8:6, then a:b:c = ?
Correct Answer: Option B
Explanation:
Combine ratios: a:b = 6:8, b:c = 8:6 ⇒ a:b:c = 6:8:6.
Combine ratios: a:b = 6:8, b:c = 8:6 ⇒ a:b:c = 6:8:6.
This question belongs to:
Maths
Ratio and Proportion
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