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      Question

      Ratio of present age of a teacher to that of his student

      is 5:1. After 6 years the ratio will become 3:1. What is the difference (in years) in their present ages?
      A 16 Correct Answer Incorrect Answer
      B 24 Correct Answer Incorrect Answer
      C 20 Correct Answer Incorrect Answer
      D 18 Correct Answer Incorrect Answer

      Solution

      Let present age of teacher and his student be โ€˜5xโ€™ years and โ€˜xโ€™ years, respectively. ATQ; (5x + 6)/(x + 6) = 3/1 Or, 5x + 6 = 3x + 18 Or, 2x = 12 Or, x = 6 Desired difference = 5x โ€“ x = 4x = 4 ร— 6 = 24 years

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