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OpenStudy (anonymous):
Crystal can wax a floor in 16 minutes. One day her friend perry helped her and it only took 5.76 minutes. How long would it take perry to do it alone?
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OpenStudy (anonymous):
in 1 min prerry can do=1/5.76-1/16=0.111111111 so perry alone can do =1/0.111111111=9 min
OpenStudy (anonymous):
yes i get it!
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