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      Question

      Four years ago, the ratio of ages of 'P' and 'Q' was 5:6.

      Six years from now, their ages will be in the ratio 7:8. Find the present age of 'Z' who is 4 years younger than 'Q'.
      A 18 yrs Correct Answer Incorrect Answer
      B 24 yrs Correct Answer Incorrect Answer
      C 59 yrs Correct Answer Incorrect Answer
      D 30 yrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the age of 'P' and 'Q', four years ago be '5a' and '6a' years, respectively.

      So, (5a + 4 + 6) : (6a + 4 + 6) = 7 : 8

      Or, 8 Γ— (5a + 10) = 7 Γ— (6a + 10)

      Or, 40a + 80 = 42a + 70

      Or, 2a = 10

      So, a = 5

      Required age = 6 Γ— 5 + 4 - 4 = 30 years

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