If Tucsos average rainfall is 12 1/4 inches and yumas is 3 3/5 inches, how much more rain, on the average, does Tucson get than yuma

Respuesta :

12 1/4 - 3 3/5 =
49/4 - 18/5 =
245/20 - 72/20 =
173/20 = 
8 13/20