Respuesta :

mfpiac12
5.1428571429
12*9=108
12+9=21
108/21=5.1428571429
texaschic101
(gz) / (g + z)....g = 12 and z = 9

(12*9) / (12 + 9) =
108 / 21 or 5 1/7 <==