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      Question

      The combined age of A and B is 70 years. The current age

      ratio of A to C is 9:10. Additionally, the average age of A, B, and C is given as 30 years. What is the age difference between A and B?
      A 25 years Correct Answer Incorrect Answer
      B 40 years Correct Answer Incorrect Answer
      C 34 years Correct Answer Incorrect Answer
      D 26 years Correct Answer Incorrect Answer
      E 44 years Correct Answer Incorrect Answer

      Solution

      Let the present ages of A, B and C be β€˜a’, β€˜b’ and β€˜c’ years respectively.
      According to the question,
      a + b = 70 --- (1)
      a: c = 9: 10 --- (2)
      a + b + c = 90
      c = 90 – 70 = 20 years
      So, a = (9/10) Γ— 20 = 18 years
      So, b = 70 – 18 = 52 years
      Required difference = 52 – 18 = 34 years

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