Question 926931
1) s= w/2+10

2) w=a+40  (or a=w-40)

3)  a+s+w=370


rewriting 3)...


{{{(w-40)+(w/2+10)+w=370}}}


{{{(5/2)w=400}}}


{{{w=160}}}

then we find the others:

{{{s=160/2+10=90}}}

{{{a=160-40-120}}}