John has 25 horses.  He feeds each horse twice a day and feeds them 20 pounds of food at each feeding.  He buys half ton bags of food.  How many of those will he have to buy in 60 days?
He feeds each horse 2*20=
<gadget id="calculator">2*20</gadget>
<output>40</output>
40 pounds of food a day.
So he uses 40*25=
<gadget id="calculator">40*25</gadget>
<output>1_000</output>
1000 pounds of food a day.
That means in 60 days he uses 60*1000=
<gadget id="calculator">60*1000</gadget>
<output>60_000</output>
60000 pounds of food.
Each bag of food is 2000*.5=
<gadget id="calculator">2000*.5</gadget>
<output>1_000</output>
1000 pounds.
So he needs to buy 60000/1000=
<gadget id="calculator">60000/1000</gadget>
<output>60</output>
60 bags of food.

<result>60</result>