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October 21, 2014

October 21, 2014

Posted by **Lynn** on Monday, November 14, 2011 at 6:57pm.

- Math -
**Frederick E.**, Monday, November 14, 2011 at 7:09pmset up an equation.. for example

d = daytime

e = evening

20d+20e=280

then 30d+12e=276

then you can use substitution and solve

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