Moments q. Could someone pls show me a better way to solve part c?

Question

I tried substitution method with simultaneous equations and got the wrong answers ><

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Answer 1 · 2018-01-27T15:25:05

The answer is #=30N#

The equations are :

#210+W=4T#

#T=(1/4)(210+W)#

#3T*0.9=(210*0.6)+1.2W#

#2.7*(210+W)/4=210*0.6+1.2W#

#2.7*210+2.7W=2.4+210+4.8W#

#(4.8-2.7)W=210(2.7-2.4)#

#2.1W=0.3*210#

#W=0.3*210/(2.1)=30N#

Is this answer right?