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? Let's think first. Chain of thought:
He needs to save up $400 because 4 x 100 = 400. He has 8 months to earn this money because 12 - 4 = 8. He needs to earn $50 a month because 400 / 8 = 50. He needs to do 5 tasks a month because 50 / 10 = 5.
Therefore, the answer is 5.