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I'm working on the same problem, can you help me understand how you derived your initial equation?

Yea, that's what I thought I was doing with f_f+f_mg=0. F_f being a function of F_n * .6 (friction coefficient). F_n is equal and opposite the force of the climber's push, right? Doesn't that give you .6Fn + 75kg *9.8 = 0?

Homework Statement A 75kg climber is supported in a "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are .8 and .6, respectively. what is the minimum normal force he must...