pahar = P
sticla = S
cana = C
farfurie = F
P + S = C
S = P + F
2 x C = 3 x F
? P = 1 S
C = P + S
C = P + P + F
C = 2 x P + F
2 C = 2 x ( 2 x P + F )
2 C = 4 P + 2 x F
3 X F = 4 x P + 2 x F
F = 4 x P
S = P + F
S = P + 4 x P
S = 5 x P
Raspuns : S = 5 x P
Sper ca te-am ajutat :)