Ratio of present ages of A and B is 7:5. After 9 years, the ratio becomes 9:6. 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 24 and 32.
Correct Answer: Option A
Explanation:
Mean proportional = √(24 × 32) = √(768) = 27.
Mean proportional = √(24 × 32) = √(768) = 27.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Two numbers are in ratio 6:4. Their difference is 60. What is their sum?
Correct Answer: Option D
Explanation:
Numbers 6k, 4k. Difference |6-4|k = 60 ⇒ k = 30. Sum = (6+4)k ≈ 350.
Numbers 6k, 4k. Difference |6-4|k = 60 ⇒ k = 30. Sum = (6+4)k ≈ 350.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Two numbers are in ratio 7:4. Their difference is 73. What is their sum?
Correct Answer: Option A
Explanation:
Numbers 7k, 4k. Difference |7-4|k = 73 ⇒ k = 24. Sum = (7+4)k ≈ 594.
Numbers 7k, 4k. Difference |7-4|k = 73 ⇒ k = 24. Sum = (7+4)k ≈ 594.
This question belongs to:
Maths
Ratio and Proportion
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