f2 = 7N
Also the turning moment provided by f2 is 7*80 = 560Nm.
(Note that you work in metres as helps prevent stupid errors).

This is of course assuming the system is in equilibrium (both rotationally due to the two moments from f1 and f2, and linearly due to a reaction force at the pivot).

Originally posted by XanthosNZ f2 = 7N
Also the turning moment provided by f2 is 7*80 = 560Nm.
(Note that you work in metres as helps prevent stupid errors).

This is of course assuming the system is in equilibrium (both rotationally due to the two moments from f1 and f2, and linearly due to a reaction force at the pivot).

I was going to ask OP if xyr Teacher said it was in equilibrium and whether xyr teacher agreed.