Billy has four horses. Each one eats 4 pounds of oats, twice a day. How many pounds of oats does he need to feed his horses for 3 days?
At each feeding Billy serves 4 horses x 4 pounds of oats/horse = 
<gadget id="calculator">4*4</gadget>
<output>16</output>
16 pounds/feeding.
Each day Billy uses 16 pounds of oats/feeding x 2 feedings/day = 
<gadget id="calculator">16*2</gadget>
<output>32</output>
32 pounds of oats/day.
Triple that amount to find the amount of oats needed to feed the four horses for three days: 32 pounds of oats/day x 3 days = 
<gadget id="calculator">32*3</gadget>
<output>96</output>
96 pounds.

<result>96</result>