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I didn't, I just said that one of the chains (presumably the right chain) has a tension of 250 N.

So the body is 500 N downwards, while the 250 N tension, the unknown tension of the second chain, and the 125 N board all oppose it, and the fact that it's in equilibrium means that the sum of all the net forces is 0, but what after that?

Homework Statement A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighting 500 N is sitting on the board. The tension in the right chain is: a) 250 N b) 375 N c) 500 N d) 625 N e) 875 N How far is the person from...