Amachine makes 150 boxes in 15 minutes what is the rate

I think its 10 boxes per minute but i could be wrong..

Since 150 is divisible by 15, you could easily divide 150 by 15.
So, your answer is 10, because 
15 X 10 Equals 150.
Also, to check your work, you could always add.
15+15=30. 30 X 2 Is 60 (15 X 4) 60 X 2=120, (15 X 8) and 15 X 2 = 30. Which is added up to 30+120, which is 150.
So your answer is 10