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July 28, 2014

July 28, 2014

Posted by **john** on Saturday, April 28, 2012 at 12:11pm.

- math -
**Henry**, Sunday, April 29, 2012 at 8:13pmX + Y =< 80.

Y => x+20.

X + (X+20) =< 80.

2x+ 20 =< 80.

2x =< 80-20.

3x =< 60.

X =< 20.

Y => 20 + 20.

Y => 40.

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