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