Q.)  Justin is making a snowball to build a fort on the winter break. 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?

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Ans.1)  wballs melting in 1 hour=2*4=8 no of balls in 1 hour=7 it will take 30 h