Richard Saltwood's car averages 620 miles on its 20-gallon tank of gas. If Richard runs out of gas and a mechanic comes to his rescue with 2 1/4 gallons of gas, determine how far his car can go

Well first you have to divide 620/20 which is 31. So his car goes 31 miles per gallon so you have 2 gallons and. 25 of a gallon. So first off 2*31=62 miles then the 1/4 or. 25. Multiply the 31 by. 25 which is 7.75 now add 62 and 7.75 and you get how far his car can go.

62+7.75=69.75 miles