Why Do Equal Torques Keep a Lever in Equilibrium?

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http://img208.imageshack.us/img208/392/untitledsx2.png

this one seems so simple...i know the answer is 3 and 4; however, I do not know how my book came to that conclusion. can anyone explain to me exactly what is going on in the above diagram? Thanks
 
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mikefitz said:
this one seems so simple...i know the answer is 3 and 4; however, I do not know how my book came to that conclusion. can anyone explain to me exactly what is going on in the above diagram? Thanks

Look at each pair of forces and at the pair of torques it would produce. Focus on the magnitudes of the force vectors and on their distance from the axis.
 

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