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July 23, 2014

July 23, 2014

Posted by **TUHITUHI** on Saturday, October 6, 2012 at 12:18pm.

- math -
**Reiny**, Saturday, October 6, 2012 at 12:54pmpresent:

son --- x

father --- 2x

in four years:

son x+4

father 2x+4

9 years ago:

son -- x-9

father -- 2x-9

2x+4 = 4(x-9)

2x+4 = 4x-36

-2x = -40

x=20

**son is now 20 , and the father is now 40**

check:

in 4 years:

son is 24

father is 44

9 years ago:

son was 11

father was 30

is 44 four times 11 ? YES

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