At the beginning of a journey, the fuel tank of a car was 34 full. When the car reached its destination, it had consumed 60% of the gasoline in the tank. The full capacity of the fuel tank was w gallons.

a Enter an algebraic expression for the amount of gasoline left in the fuel tank.
gal

b If w = 15.5, how much gasoline was left in the tank at the end of the journey?
gal