m=(t+120)-(80:2) m |____________| +120-(80:2) t |____________| -120
t=m-120 b |____________| +80
b=m+80 --------------------------------------------
------------------------- 923lei
=>923lei
120+80=200
923-200=723
723:3=241
m=>(t+120)-(80:2)
m=241+120-40
m=321
t=> (m-120)
t=321-120
t=201
b=>(m+80)
b=321+80=401
b=401
m+t+b=923lei
321+201+401=923lei