A carpenter is building a house. He needs 80 woodblocks to build it. If he has 8 logs that can make five woodblocks each, how many logs does the carpenter still need?
The carpenter initially has 8 x 5 = 
<gadget id="calculator">8*5</gadget>
<output>40</output>
40 blocks of wood.
So he still lacks 80 - 40 = 
<gadget id="calculator">80-40</gadget>
<output>40</output>
40 blocks of wood.
Therefore he still needs 40 / 5 = 
<gadget id="calculator">40/5</gadget>
<output>8</output>
8 logs of wood.

<result>8</result>