physics
posted by bob on .
person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg.
a. determine the force exterted on the board by the post on the left end.
b. determine the force exerted on the board by the post on the right end.
I got 21.25 for F left and 73.75 for F right.
Is that right?

I can tell you right off it is wrong. The sum of the forces on the two supports have to equal the weights on the board, which is 20g+75g.

i am sorry but i don't get how to do it