it is known that the sum of three numbers is 850. The first is one-third of the second and the third number is double the second. What are the numbers supported in the bar scheme to solve the problem?

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same