SOLUTION: Four years ago, Robert was four times as old as his son was at the time. At tye present, Robert is three times as old as his son. How old is his son?

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Question 1170658: Four years ago, Robert was four times as old as his son was at the time. At tye present, Robert is three times as old as his son. How old is his son?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
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At tye present, Robert is three times as old as his son.
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?

What was that? Is supposed to be this instead?
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At present, Robert is three times as old as his son.
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Ages 3x and x at present time.
%283x-4%29=4%28x-4%29
-
3x-4=4x-16
-4%2B16=x
highlight%28x=12%29--------------his son now