The age of a man after 15 yr is 4 times the age of that man 15 yr before. His present age is?

10 yr
15 yr
20 yr
25 yr

Correct Answer: 25 yr

Explanation:

Let present age of man be k yr.
According to the question,
k + 15 = 4(k - 15)
⇒ k - 15 = 4k - 60
⇒ 3k = 75
∴ k = 25
Hence, the present age of man is 25 yr.

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