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by bburton11 » Wed Jun 10, 2009 5:34 am
Machine A produces pencils at a constant rate of 9,000 pencils per hour, and machine B produces pencils at a constant rate of 7,000 pencils per hour. If the two machines together must produce 100,000 pencils and if each machine can operate for at most 8 hours what is the least amount of time, in hours, that machine B most operate?

Answer: 4
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by tohellandback » Wed Jun 10, 2009 5:44 am
this is simple..
we want the lest time for machine B. let machine A run the whole 8 hours. A
produces 72,000 pencils.
rest 28,000 must be produced by B.
so 4 hours is the answer
The powers of two are bloody impolite!!
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