A cell phone company sold 450 cell phones in three hours. This was 30% of the number of phones sold that day. How many cell phones did the cell phone company sell that day?
450 = 30%
450/3 = 150 = 10%
150*10 = 1500 = 100%
Therefore, the cell phone company sold 1,500 cellphones that day.
Let X = total cell phones sold, then
0.30X = 450
X = 450/0.30 = 1500