Prima zi: x/4
A doua zi: (x-x/4)/3=3x/4 x 1/3= x/4
A treia zi: (2x/4)/2=2x/4 x 1/2= x/4
A patra zi=50 km
x/4+x/4+x/4+50=x
3x/4+50=x
50=4x/4 - 3x/4
x/4=50
4 x 50 = 200 km
Calatorul a parcurs 200 de kilometri.
Succes!
