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Bones
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Homework Statement
Three children are trying to balance on a seesaw, which includes a fulcrum rock acting as a pivot at the center (x = 0), and a very light board 5.2 m long (see figure). Two playmates are already on either end. Boy A has a mass of 50 kg, and boy B a mass of 35 kg. Where should girl C, whose mass is 25 kg, place herself so as to balance the seesaw?
http://www.webassign.net/gianpse4/12-57.gif
Homework Equations
The Attempt at a Solution
(45kg)(9.8m/s^2)(-2.6m)-(35kg)(9.8m/s^2)(2.6m)+(25kg)(9.8m/s^2)(x)
-1146.6N*m-891.8N*m+245N(x)
-2038.4N*m=-245N(x)
x=8.32m which is clearly not correct...please help!