Multiple choice

A year ago, Rahul was four times his son's age. In six years, his age will be 9 more than twice his son's age. What is the present age of the son?

  1. 20 years

  2. 9 years

  3. 10 years

  4. 12 years

  5. 8 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let present ages be Rahul (R) and son (S). One year ago: R-1 = 4(S-1). In 6 years: R+6 = 2(S+6) + 9. Solving these equations: From first, R = 4S - 3. Substituting in second: 4S - 3 + 6 = 2S + 12 + 9, giving 2S = 18, so S = 9 years.

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