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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