Dexter has five pigs. Each one eats 4 pounds of feed, twice a day. If Dexter ordered 300 pounds of feed, how many pounds of feed is left after a week?
In a day, one pig consumes 4 x 2 = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 pounds of feed.
In a day, five pigs consume 8 x 5 = 
<gadget id="calculator">8*5</gadget>
<output>40</output>
40 pounds.
In a week, five pigs consume 40 x 7 = 
<gadget id="calculator">40*7</gadget>
<output>280</output>
280 pounds.
So, there are 300 - 280 = 
<gadget id="calculator">300-280</gadget>
<output>20</output>
20 pounds of feed left.

<result>20</result>