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      Question

      Five years ago, the age of A was 3 times the age of B.

      After 7 years, the difference between their ages will be 28 years. Find the present age of A.
      A 55 yrs Correct Answer Incorrect Answer
      B 24 yrs Correct Answer Incorrect Answer
      C 38 yrs Correct Answer Incorrect Answer
      D 47 yrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Let present ages be x and y.
      x – 5 = 3(y – 5)
      x + 7 – (y + 7) = 28
      ⇒ x – y = 28
      From first:
      x – 5 = 3y – 15
      x = 3y – 10
      Substitute:
      3y – 10 – y = 28
      2y = 38
      y = 19
      x = 3(19) – 10 = 47
      Present age of A = 47 years

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