Physics
posted by Anonymous .
A 5.00 m long rigid beam with a mass of 200.0 kg is supported at each end. A 55.0 kg student stands on the beam, 1.40 m from the left support and a 70 kg student stands 1.2 m from the right support. How much upward force does each support exert on the beam? Be specific by left support and right support.
I am confused...

L = the left and and
The summation of moments about the left end support is 1.4(55) + 3.8(70)  5R.
Solve for R, the right end support load.
The summation of vertical forces is
L  55  70 + R.
Solve for L.