Răspuns :
x=lungime drum
28%x+18=x
28x/100+18=x
28x+1800=100x
72x=1800
x=25 km
28%x+18=x
28x/100+18=x
28x+1800=100x
72x=1800
x=25 km
18 km------------------72%
x-------------------------100%
x=(18*100)/72=25 km
x-------------------------100%
x=(18*100)/72=25 km