a=ha arate ziua1
1,5a=ha arate ziua 2
1,5a×2=3ha arate ziua 3
a+1,5a+3a=220
5,5a=220
a=40 ha ziua 1
1,5a=1,5×40=60 ha ziua 2
3a=3×40=120 ha ziua 3
2.
x=lungime drum
25%x=25x/100=x/4
x-x/4=3x/4=rest dupa ziua 1
3x/4 × 1/3=x/4=ziua 2
x/4+x/4+55,3=x
x+x+221,2=4x
2x=221,2
x=110,6 km