Weight of a big guy.?

Figure 12.16 shows how a scale with a capacity of only 250 N can be used to weigh a heavier person. The board is 3 m long, has a m of 3.4 kg, and is of uniform density. It is free to pivot about the end farthest from the scale. What is the weight of a person standing d = 1.0 m from the pivot end if the scale reads 180 N? ume that the beam remains nearly horizontal.