Lizzy: Farmer Randy has 1700 acres of cotton he needs to have planted in 5 days. With a crew of 2 tractors working for 2 days and then a crew of 7 tractors working for another 3 days, how many acres of cotton per day does each tractor need to plant to meet their planting deadline?.
Me: Hmmm, let me think. I think this is the detailed solution:
With 2 tractor teams working for 2 days, this is like 2 * 2 = 4 days worth of work by a single tractor, which they call tractor days. With 5 tractor teams working for 4 days, this is 7 * 3 = 21 tractor days. In total, the effort of all the tractor teams is 4 + 21 = 25 tractor days. If they need to plant 1700 acres with their 25 tractor days, then each tractor team needs to plant 1700 / 25 = 68 acres of cotton per day. Final answer: 68.