How many hours are required to build 210 snowballs in the following case? Justin is making snowballs to build a fort on the winter break. He can build 15 snowballs/hour but two snowballs melt every 15 minutes. How long will it take him to build 210 snowballs.

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Justin builds 15 snowballs in an hour and 2 snowballs melt every 15 minutes.

So in an hour he...

(The entire section contains 43 words.)

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