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30-x - ilość 15m
18x+15(30-x)=480
18x+450-15x=480
3x=480-450
x=30/3
x=10 wagonów 18m
30-10=20 wagonów 15 m
20*15m=300m
10*18m=180m
300m+180m=480m
Odp:Jest 20 krotszych wagonow i 10 dluzszych wagonow.