2 answers:
Let Jeff's age = x and Ben's age = x - 9.
(x + 10) + (x -9 + 10) = 67
x + 10 + x + 1 = 67
2x + 11 = 67
2x = 56
x = 28
x - 9 = 28 - 9 = 19
Jeff is 28 years old, and Ben is 19 years old.
If Jeff is x years old, Ben is x - 9 years old.
Ten years later, Jeff would be x + 10 years old and Ben would be (x - 9) + 10 years old.
x + 10 + (x - 9) + 10 = 67
2x + 11 = 67
2x = 56
x = 28
Jeff is 28 right now and Ben is 19 right now.
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