6m=600cm
a+a+310cm=600cm
2a=600cm-310cm
2a=290 cm
a=290cm/2
a=145 cm bucata mai mica
b=145cm+310cm
b=445cm
I__________I____________I___________I____________I__________I____________I 6m sau 600cm
I____a__________I________b_________I________________b________________I
145cm 145cm + 310cm