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 C’s age after 20 years?Solution
Sum of present ages of A, B and C = 22 × 3 = 66 years
Sum of present ages of A and B = 12 × 2 + 20 = 44 years
Present age of C = 66 – 44 = 22 years
Desired age = 22 + 20 = 42 years
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