Posted by Katie on Thursday, April 17, 2008 at 8:07pm.
A new photocopier can make 72 copies in 2 min. When an older photocopier is working, the two photocopiers can make 72 copies in 1.5 min. How long will it take the older photocopier working alone to make 70 copies?

Algebra  Katie, Thursday, April 17, 2008 at 8:10pm
How would you set it up? Would it be (72/2) + (72/1.5)= (70/x)? we didn't do examples in class

Algebra  Damon, Thursday, April 17, 2008 at 8:45pm
new > 36 copies/min
old > n copies/min
new + old = (n+36) copies/min
(n+36)copies/min * 1.5 min = 72 copies
1.5 n + 54 = 72
1.5 n = 18
n = 12 copies/min
12 copies/min * t = 70 copies
t = 35/6 = 5.83 min

Algebra  Damon, Thursday, April 17, 2008 at 8:49pm
I wrote out all those copies/ min and such for a reason. In problems like this if you keep track of the units, it is hard to go far off course.

Geometry  8===D, Monday, April 22, 2013 at 5:55pm
I am stuck on this one too :(
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