Respuesta :
15 1/5 + 5 3/5 = 20 4/5
that is the total gallons of gas avalible
but they only used 17 4/5, so
20 4/5 - 17 4/5 = 3
so he only had 3 galons left after the trip
that is the total gallons of gas avalible
but they only used 17 4/5, so
20 4/5 - 17 4/5 = 3
so he only had 3 galons left after the trip