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May 3, 2015

Homework Help: math

Posted by sh on Thursday, February 19, 2009 at 8:17pm.

ab+cd=34
ac+bd=38
ad+bc=43
what is a+b+c+d=?
multiple choice:
a)15 b)16 c)17 d)18 e)19

First, I tried guessing and testing, but couldn't find the correct answer.
Then I tried isolating a
a=(34-cd)/b

I'm stuck, there are too many variables

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