Multiple choice

After 15 years, Ralph's age will be five times his age 5 years back. What is the present age of Ralph?

  1. 10 years

  2. 15 years

  3. 20 years

  4. 22 years

  5. 25 years
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A Correct answer
Explanation

Let age be x. (x + 15) = 5(x - 5). x + 15 = 5x - 25. 4x = 40, x = 10.

AI explanation

Let Ralph's present age be R years. After 15 years, his age will be R + 15, and 5 years back, his age was R - 5. The given equation is R + 15 = 5(R - 5), which expands to R + 15 = 5R - 25. Solving this equation gives 4R = 40, so R = 10. Ralph's present age is 10 years.

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