A+A+A=90 => 3A=90 => A=90:3=30
A+2B+2B=230 = 30+4B=230 => 4B=230-30=200 => B=200:4=50
C+2B+A=210 => C+100+30=210 => C=210-100-30=80
=> B-A+C=50-30+80=100
A + A + A = 90 => A = 90: 3 = 30
A + 2B + 2B = A + 4B = 230 => 230 - A = 4B
=> 230 - 30 = 200
=> 4B = 200 : 4 = 50
C + 2B + A = 210 => C + 100 + 30 = 210
=> C = 210 - 30 - 100 = 80
=> B - A + C = 50 - 30 + 80 = 100
A+A+A=90 => 3A=90 => A=90:3=30
A+2B+2B=230 = 30+4B=230 => 4B=230-30=200 => B=200:4=50
C+2B+A=210 => C+100+30=210 => C=210-100-30=80
=> B-A+C=50-30+80=100