numarul initial de mere
|____|____|____|____|
Ana
|____|
rest1 |______________|
Sanda
|________|
rest2 |___|___|___|
Alexandra
|___|
rest3 |___|___| 10 mere
10 : 2 = 5 mere (Alexandra)
5×3 = 15 mere (Sanda)
15×2 = 30
30 : 3 = 10 mere (Ana)
10 × 4 = 40 (mere au fost initial in cos)
Verificare:
5+15+10+10 = 40