Răspuns:
7200 cm = 72 m
20 dm = 2 m
Prima bucata /-------/ + 2 / + 4
A doua bucata /-------/ + 2 } 72
A treia bucata /-------/
72 - (2 + 4 + 2) = 72 - 8 = 64
64 : 3 = 21,33 m are partea a treia
21,33 + 2 = 23,33 m are a doua parte
21,33 + 6 = 27,33 m are prima parte