Răspuns:
Prima zi : x/3 => rest 2x/3
A doua zi : 2x/3 • 1/3 - 8 = 2x/9 - 8 = (2x - 72)/9 => noul rest 2x/3 - (2x - 72)/9 = (4x + 72)/9
A treia zi : 2/3 • (4x + 72)/9 - 10 = (8x + 144 - 270)/27 = (8x - 126)/27
A patra zi : 46 lei
x/3 + (2x - 72)/9 + (8x - 126)/27 + 46 = x
9x + 6x - 216 + 8x - 126 + 1242 = 27x
4x = 900
x = 225 lei