How to calculate the pressure of a plane on the ground

i need this for homework here is the question:
A plane sits on the grass at the airport. the plane is sitting on three wheels, each wheel has an area of 0.04m2 in contact with the ground. it has a weight of 15000 newtons.
calculate the pressure of the tyres:

pressure is force divided by area. The force is 15,000 Newtons. The area is three times 0.04 meters squared.

15,000/ 0.12 = 125,000 Newtons/m^2