4 sticle suc de 2 L jumatate = 2,50×4=10 L suc
8 sticle de 500 ml = 8×500=4000 ml = 4 L suc
4 sticle de 250 ml = 4×250=1000 ml= 1 L
2 sticle de cate 500 ml = 2×500=1000 ml = 1 L suc ( ce a ramas )
10L +4 L + 1L =15 L suc ( totalul de suc cumpărat )
15L - 1L = 14 L suc ( s-au consumat )