Multiple choice

The age of a man after 15 yr is 4 times the age of that man 15 yr before, his present age is

  1. 10yr

  2. 15yr

  3. 20yr

  4. 25yr
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D Correct answer
Explanation

Let the present age be x. The equation is (x + 15) = 4(x - 15). Solving this, x + 15 = 4x - 60, so 3x = 75, which means x = 25.

AI explanation

Let the man's present age be x years, making his age after 15 years x + 15 and his age 15 years ago x minus 15. The problem states x + 15 = 4(x - 15), which expands to x + 15 = 4x - 60. Rearranging terms gives 3x = 75, so the man's present age is 25 years.

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