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July 24, 2014

July 24, 2014

Posted by **Adam** on Wednesday, November 9, 2011 at 6:25am.

- Mathematics -
**Reiny**, Wednesday, November 9, 2011 at 9:41amLet 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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