7th grade math counts

Mathematics
Tutor: None Selected Time limit: 1 Day

Jack Frost makes 18 snowballs every hour, but 2 snowballs melt each 15 minutes. How may hours will it take Jack to accumulate 2 dozen snowballs? Express your answer as a decimal to the nearest tenth.  

Jan 29th, 2015

Jack can produce 18-2*60/15= 10 snowballs every hour. 

Since 2 dozen = 24, 

24 /10=2.4 

It takes 2.4 hours until Jack made 2 dozen snowballs. 

Jan 29th, 2015

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