Answer:
460 miles
Explanation:
Since it is a ratio problem, you see that the prius drives 70 miles on 2 gallons of gas which gives you 70:2 or 70/2.
You also set up the other ratio as a fraction with the unknown value as x --> x/13.
now, you cross multiply
70/2=x/13
70*13=910
910/2=460
460 miles