SOLUTION: Having problems pulling out an equation from: An office has an old copying machine and a new one. Working together it takes both machines 4 hours to make all of the copies of the

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Question 347701: Having problems pulling out an equation from:
An office has an old copying machine and a new one. Working together it takes both machines 4 hours to make all of the copies of the annual financial report. Working alone it takes the old copying machine 15 hours longer than the new one to make all of the copies. How long would it take the new copying machine to make all the copies alone?
Thank you for your assistance
Heather

Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
each machine does some FRACTION of the job , based on the individual time
___ the fractions sum to one (the WHOLE job)

(4 / x) + [4 / (x + 15)] = 1