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Dupa ce a parcurs 20% dintr-un drum, un calator constata ca mai de parcurs 120 km.Cati km are drumul

Răspuns :

x-20/100dinx=120

100x-20x=12000

80x=12000

x=12000:80

x=150 km are drumul

80% ........... 120 km 
100% ..............x km

x = 120·100 : 80 = 150 km