The #712 school bus traveled 150 miles on 10 gallons of gas. how many miles per gallon does the bus get?

15 miles per gallon because you divided 10 gallons by 10 to get 1 gallon (your base unit in this case) and then you divided 150 miles by 10 because you need to do this to both variables, getting 15:1 or 15 miles per gallon