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Un biciclist a parcurs 120 km in 3 zile.Stiind ca in primele doua zile a parcurs 90 km, iar in ultimele doua zile 70 km, afla cati km a parcurs in fiecare zi.

Răspuns :

120-70=50km a parcurs in 1 zi
90-50=40km a parcurs in a 2 zi
70-40=30km a parcurs in a treia zi