Daniel L. answered • 02/18/17

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Hi Ashly,

Let X = Brad's age now.

Then Sam is X + 12 years old now.

17 years ago, Brad was X - 17 years old and Sam was (X+12) - 17 years old or X - 5 years old.

Sam was 4 times as old as Brad, so 4(X-17) = X-5

4X - 68 = X - 5

3X = 63

X = 21 which is Brad's age now.

Then Sam is X + 12 = 33 years old.

Confirm by making sure that Sam was 4X as old as Brad 17 years ago.

Dan