Posted by **StuartKess** on Wednesday, September 7, 2011 at 12:18am.

Machine A pack = 7200/p boxes of cookies

Machine B pack = 7200/p+2.60 boxes of cookies

Machine A can pack 1560 more boxes of cookies thanks machine B.

Form an equation which reduces to 1560p^2 + 4056p - 18720 = 0 and explain why is this equation is true.

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