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x=16:4/5
x=20
cała droga ma 20 km
jeśli przebył 4/5 drogi to
16 km : 4 = 4km razy 5 (całość drogi) = 20km
Całość drogi to 20km
x km ------- 1
4/5x = 16 |:4/5
x = 16*5/4
x = 80/4
x = 20 [km]