Ernest is going to ship some gifts to family members, and he is considering two shipping companies. The first shipping company charges a fee of $14 to ship a medium box, plus an additional $6 per kilogram. A second shipping company charges $15 for the same size of box, plus an additional $5 per kilogram. At a certain weight, the two shipping methods will cost the same amount. What is that weight? How much will it cost?
At a weight of kilograms, the two shipping methods both cost $.