Annie & steve were assigned kitchen duty at camp. they agreed that each
would peel half of the potatoes for the upcoming meal. annie peels 5
potatoes a minute and steve can peel 3 potatoes per minute.
steve gets a 4-minute head start, and then they continue peeling until they
have finished the pile. if they each peel the same number of potatoes, how
many potatoes were there when they started?