Resposta:
#color (verd) (2) #
Explicació:
Si #color (blau) (x = 1) i #color (vermell) (y = 1)
llavors
# (color (vermell) (i) + color (blau) (x)) div2 + color (blau) (x) #
#color (blanc) ("XXX") = (color (vermell) (1) + color (blau) (1)) div2 + color (blau) (1) #
#color (blanc) ("XXX") = (2) div2 + color (blau) (1) #
#color (blanc) ("XXX") = 1 + color (blau) (1) #
#color (blanc) ("XXX") = 2