Every tree that Bart cuts down gives him 75 pieces of firewood.  If he burns 5 logs a day from November 1 through February 28, how many trees will he need to cut down?
November has 30 days, December has 31 days, January has 31 days and February has 28 days for a total of 30+31+31+28 = 
<gadget id="calculator">30+31+31+28</gadget>
<output>120</output>
120 days.
He burns 5 pieces of wood every day so 120*5 = 
<gadget id="calculator">120*5</gadget>
<output>600</output>
600 pieces of wood.
Every tree he cuts down supplies 75 pieces of firewood and he will burn 600 pieces so he needs 600/75 = 
<gadget id="calculator">600/75</gadget>
<output>8</output>
8 trees.

<result>8</result>