Answer: 280 miles
Step-by-step explanation:
Given : Mr. fink's economy car can travel on 420 miles on a 12-gallon tank of gas .
i.e. the number of miles of miles car can travel in one gallon :-
[tex]\dfrac{420}{12}=35\text{ miles}[/tex]
Then , the number of miles Mr. fink's car can travel in 8 gallons :-
[tex]8\times35=280\text{ miles}[/tex]
Hence, the number of miles Mr. fink's car can travel in 8 gallons = 280 miles