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=
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 crayons.
In an hour, they make 8*5=
<gadget id="calculator">8*5</gadget>
<output>40</output>
40 crayons.
In 4 hours they make 4*40=
<gadget id="calculator">4*40</gadget>
<output>160</output>
160 crayons.

<result>160</result>