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      Question

      The sum of the present age of 'T' and 'O' is 60 years. The

      ratio of the age of 'T' and 'O' before 10 years is 3:5 respectively. Find the age of 'O' after 10 years.
      A 50 years Correct Answer Incorrect Answer
      B 65 years Correct Answer Incorrect Answer
      C 45 years Correct Answer Incorrect Answer
      D None of the above Correct Answer Incorrect Answer

      Solution

      Let the age of 'T' and 'O' before 10 years be 3x years and 5x years.

      So, the present age of 'T' = (3x + 10) years

      So, the present age of 'O' = (5x + 10) years

      So, 3x + 10 + 5x + 10 = 60

      Or, 8x = 60 - 20 = 40

      So, 'x' = 5

      So, present age of 'O' = 5x + 10 = 25 + 10 = 35 years

      Therefore, required age = (5 X 5 + 10 + 10) = 45 years

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