Posted by Adam on Wednesday, November 9, 2011 at 6:25am.
Let John's present age be x
Four years ago John was x-4
Half of John's age 4 years ago = (x-4)/2
John's age in 5 years from now = x+5
a third of his age 5 from now = (x+5)/3
(x-4)/2 = (x+5)/3
cross-multiply
3x - 12 = 2x + 10
x = 22
So John is now 22 years old
check:
4 years ago he would have been 18
5 years from now he will be 27
is half of 18 equal to a third of 27 ? YES
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