Q2) Justin is making snowballs 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?
A: We are given that, every 60 minutes Justin makes 15 snowballs, but out of the 15 snowballs made in that 60 minutes 8 of them melt. Therefore, Justin is making snowballs at a rate of 7 snowballs every 60 minutes. This gives the proportion:
7/60=210/x, since we want to know the time it takes. So x=1800 minutes.
Do these answers look ok?