Calculate Compression Stress for 500 kg Car Tire Ring

[Reema]

A 500 kg car uses 10 kg aluminum alloy tire ring, what is the compression stress on one of the wheel rings if the contact area is 0.10 m^2 with the tire


so the model answer is
stress = F\A
127.5\0.1 = 12,750 Pa

where did we get the force from ?

127.5 ?

 

[SteamKing]

(500 kg + 10 kg) / 4 = 127.50 kg The question as worded doesn't make too much sense.
Apparently, the car has four tires but uses only one tire ring (wheel?) to support itself. I don't know why the mass of the tire ring (rings?) isn't already included in the total mass of the car.