6 sticle × 3 litri = 18 litri
9 sticle × 2 litri = 18 litri
4 sticle×3 litri + 3 sticle × 2 litri =
12 litri + 6 litri =
18 litri
2 sticle × 3 litri + 6 sticle × 2 litri =
6 litri + 12 litri =
18 litri
B)
18 litri : 1,5 litri = 12 (sticle de 1,5 litri se folosesc)