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      Question

      Ten years ago, the average age of A and B was 12 years.

      The average age of A, B and C now is 22 years. What will be CтАЩs age after 20 years?
      A 21 yrs Correct Answer Incorrect Answer
      B 42 yrs Correct Answer Incorrect Answer
      C 53 yrs Correct Answer Incorrect Answer
      D 31 yrs Correct Answer Incorrect Answer

      Solution

      Sum of present ages of A, B and C = 22 ├Ч 3 = 66 years
      Sum of present ages of A and B = 12 ├Ч 2 + 20 = 44 years
      Present age of C = 66 тАУ 44 = 22 years
      Desired age = 22 + 20 = 42 years

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