A crayon factory makes 4 colors of crayons. They put 2 of each color crayon in each box. The factory produces enough crayons to fill 5 boxes per hour. How many crayons does the factory produce in 4 hours?
Each box contains 4*2=<<4*2=8>>8 crayons.
In an hour, they make 8*5=<<8*5=40>>40 crayons.
In 4 hours they make 4*40=<<4*40=160>>160 crayons.
#### 160