A farmer is baling hay in their field. Each hour the farmer makes 5 bales. At the same time, a truck is picking the hay bales up. Each hour the truck picks up 3 bales of hay. If the farmer and the truck driver put in a 6 hour day, how many bales of hay are left in the field?
The farmer makes 5*6= 
<gadget id="calculator">5*6</gadget>
<output>30</output>
30 bales of hay.
The truck takes away 3*6= 
<gadget id="calculator">3*6</gadget>
<output>18</output>
18 bales of hay.
There are 30-18= 
<gadget id="calculator">30-18</gadget>
<output>12</output>
12 bales of hay left in the field.

<result>12</result>