Answer: a. 126.20 gallons.
        b. 2740 miles.
Step-by-step explanation:
We will use unitary method in this question.
a) ∵ 310 miles can be covered by a car with the help of 15.5 gallons of gasoline
  ∴ 1 mile can be covered = [tex]\frac{15.5}{310}[/tex]gallons
  ∴2524 miles can be covered = [tex]\frac{15.5}{310}(2524) gallons[/tex]
                           = 126.20 gallons
b). ∵ With 15.5 gallons of gasoline car can be driven = 310 miles
   ∴ With 1 gallon of gasoline car can go = 310/15.5 miles
   ∴ With 137 gallons can can go = (310×137)/15.5 miles
                             = 2740 miles.
