Respuesta :

12.55 is the decimal form
legendowl47
first you need the same denominator so the first one will change to3 16/20 and the second one will change to 8 15/20 
3 16/20 + 8 15/20 =
11 31/20 simplified to
12 11/20
3 4/5 + 8 3/4= 12 11/20