Static EQUILIBRIUM of a body

The beams of negligible mass with an overall length of 7m

The beam is supported by a pivot point that is 3m from the left hand side

and 4m from the right

To the right on the pivot, FORCES of 10N and 25 N are applied at a distance of 1m and 4m respectively

to the left of the pivot is an unknown force, F, which is applied 3m from the pivot

the direction of action of each of these forces is as shown

determine the value of the unknown FORCE F, needed to preserved EQUILIBRIUM

http://i10.photobucket.com/albums/a1...5/DSC00981.jpg

:confused: is it M=F*d

Moment = Nm

Force = N

distance = Meters

how i work it out?

cheers:confused: