The Singleton family is looking to rent a large truck for their upcoming move. With Erin's Moving, they would pay $41 for the first day plus $5 per additional day. With Greenpoint Rent-a-Truck, in comparison, the family would pay $31 for the first day plus $7 per additional day. Before deciding on which company to use, Mrs. Singleton wants to find out what number of additional days would make the two choices equivalent with regards to cost. What would the total cost be? How many additional days would that be?