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March 28, 2015

March 28, 2015

Posted by **Anonymous** on Monday, April 30, 2012 at 8:06pm.

- math -
**Anonymous**, Monday, April 30, 2012 at 10:56pmrate is 120 cards per hour y=120x

y=120(6)

120(6)= 720

he files 720 cards after 6 hours

so 900-720= 180

180 cards left to file

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