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Mathematics 39 Online
OpenStudy (anonymous):

. Whcih operation would you use? On Blah Buster Day Sierra and Stephanie decided to sort their colored pens. They counted the pens and found that they had forty-five pens in all. They divided the pens into three stacks: pens to keep, pens to trade, and pens to throw away. When they finished, there was an equal number of pens in each stack. How many pens were in each stack?

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