word problems (math)

label Mathematics
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schedule 1 Day
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justin is making snowballs to build a fort. justin can build 15 snowballs in an hour but 2 snowballs melt every 15 minutes. how long will it take him to build 210 snowballs? 

Oct 20th, 2017

each hr he has 15-8 = 7 net snow ball, so it will take him 210/7 = 30 hrs to build 210 snowballs

Jan 20th, 2015

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