Răspuns:
Explicație pas cu pas:
C = numarul total al conservelor
Prima luna 3C/5 conserve folosite
rest C - 3C/5 = 5C/5 - 3C/5 = 2C/5
A doua luna 7/8 x 2C/5 = 14C/40 = 7C/20
rest 2C/5 - 7C/20 = 8C/20 - 7C/20 = C/20
C/20 = 5 conserve
C = 20 x 5 = 100 conserve
Prima luna 3*100/5 = 60 conserve
A doua luna 7*100/20 = 35 conserve