Gerald spends $100 a month on baseball supplies. His season is 4 months long. He wants to use the months he's not playing baseball to save up by raking, shoveling, and mowing lawns. He charges $10 for each. How many chores does he need to average a month to save up for his supplies?
He needs to save up $400 because 4 x 100 = 
<gadget id="calculator">4*100</gadget>
<output>400</output>
400.
He has 8 months to earn this money because 12 - 4 = 
<gadget id="calculator">12-4</gadget>
<output>8</output>
8.
He needs to earn $50 a month because 400 / 8 = 
<gadget id="calculator">400/8</gadget>
<output>50</output>
50.
He needs to do 5 tasks a month because 50 / 10 = 
<gadget id="calculator">50/10</gadget>
<output>5</output>
5.

<result>5</result>