A cup of dog food weighs 1/4 of a pound.  If Mike has 2 dogs that each eat 6 cups of dog food twice a day how many 20 pound bags of dog food does he need to buy a month?
Each dog eats 6*2=
<gadget id="calculator">6*2</gadget>
<output>12</output>
12 cups of food a day.
His two dogs eat 12*2=
<gadget id="calculator">12*2</gadget>
<output>24</output>
24 cups a day.
Thus they eat 24/4=
<gadget id="calculator">24/4</gadget>
<output>6</output>
6 pounds a day.
So they eat 6*30=
<gadget id="calculator">6*30</gadget>
<output>180</output>
180 pounds a month.
So he needs to buy 180/20=
<gadget id="calculator">180/20</gadget>
<output>9</output>
9 bags of food.

<result>9</result>