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pali 5litrów na godzinę
60 - X = 20
60-40 = 20
musi spalic 40 litrów
40l / 5 l= 8
8 * 100km = 800 (km)
samochod musi przejechac trasę 800km aby w baku pozostalo 20l. benzyny
5 - 100
40 - x
x=40*100÷5=800km
Odp. Po 800 km.