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The present age of a father is three times that of his son. After 5 years, the father will be 2.5 times as old as his son. Find the father's present age (in years).

Competition practiceAverages & Ages
  • A42
  • B48
  • C45
  • D36

Step-by-Step Solution

Let son = S, father = 3S. Then 3S + 5 = 2.5(S + 5), so 0.5S = 7.5, S = 15 and father = 45.
Answer: C) 45

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