Răspuns:
Explicație pas cu pas:
1 pahar + 1 sticla = 1 cana
1 sticla = 1 pahar + 1 farfurie rezulta 1 farfurie = 1 sticla - 1 pahar
3 cani = 4 farfurii
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3(1 pahar + 1 sticla) = 4(1 sticla - 1 pahar)
3 pahare + 3 sticle = 4 sticle - 4 pahare
3 pahare + 4 pahare = 4 sticle - 3 sticle
7 pahare = 1 sticla