Eighteen years ago, the sum of the ages of Bill and Paul was 39. What is the sum of their present ages?
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let B be the present age of Bill and P be the present age of Paul, then we have
( B − 1 8 ) + ( P − 1 8 ) = 3 9
B − 1 8 + P − 1 8 = 3 9
B + P = 3 9 + 1 8 + 1 8 = 7 5