Posted by Jonathan on Saturday, October 31, 2009 at 10:48pm.
OK. That's the first sentence covered in x+2y=56 .
In 8 years time, the son's age will be half of john's age.
If x is John's age now, then his age in 8 years is (x+8), and his son's will be (y+8).
So the next thing is to make a second equation from that sentence, using (x+8) and (y+8) for the ages.
x=20 and y=18
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