Question

the front wheels of a truck supports 8 kN and its rear wheels support 14 kN. The axles are 4m apart. How far from the front axle is the center of gravity of the truck

Answer 1

Think of this as a balance beam with the fulcrum at the center of gravity.
If the distance is x, then you need
8x = 14(4-x)

Answer 2

2.55