8 sticle de 1/2 a pus 4 l
4 sticle de 1 l a pus 4 l
sau
Preesupunem ca toate sticlele sunt de 1 l
12 * 1 = 12 l
Diferenta dintre val. reala si val. presupusa
12 - 8 = 4 l in sticle de 1/2
4 * 2 = 8 sticle de 1/2 l
12 - 8 = 4 sticle de 1 l
8 - 4 = 4 l
8 + 4 = 12 sticle
4 + 4 = 8 l