Four years ago the average age of $A, B$ and $C$ was $25$ years. Five years ago the average age of $B$ and $C$ was $20$ years. $A$'s present age is

Four years ago, the average age of A, B, and C was 25, so their total age was 3 times 25 = 75. Their present total age is 75 + 3(4) = 87. Five years ago, the average age of B and C was 20, so their total was 2 times 20 = 40. Their present total age is 40 + 2(5) = 50. A's present age is 87 minus 50 = 37 years.

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