Răspuns:
I zi : x/5 =>rest 4x/5
II zi : 1/3 • 4x/5 = 4x/15 =>rest 4x/5 - 4x/15 = 8x/15
III zi : 1/3 • 8x/15 = 8x/45 =>rest 8x/15 - 8x/45 = 16x/45
IV zi : 1/2 • 16x/45 + 5 = 8x/45 + 5
V zi : 19
x/5 + 4x/15 + 8x/45 + 8x/45 + 5 + 19 = x
9x+12x+16x+24•45=45x
8x=24•45
x=135