How long will it take him to build 210 snowballs?

Justin is making snowballs to build a fourt. Justin can build 15 snowballs in an hour, but 2 snowballs melt every 15 minutes. How long will it take home to build 210 snowballs?
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1 Answer

In one hour (4×15 mins) Justin makes 15 snowballs but loses 8 through melting, so the net number of snowballs after an hour is 15-8=7. He needs to make 210 so it will take him 210/7=30 hours.

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