A certain car can travel 20 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?  Choose one.
A) 16.67%
B) 20%
C) 25%
D) 30%
E) 40%
Let, Tank capacity = T gallon   Used Fuel = (T-8) gallons   Distance Travelled (@60 miles/hr) = 80 miles   Distance travelled in 1 gallon = Distance travelled in 20 mins (@60 miles/hr) = (60/60)*20= 
<gadget id="calculator">(60/60)*20</gadget>
<output>20</output>
20 miles   Fuel used to travel 80 miles= (80/20)= 
<gadget id="calculator">(80/20)</gadget>
<output>4</output>
4 gallon   i.e. Used fuel= (T-8) = 4 gallon   i.e. T = 12 Gallons   i.e. Used Fuel = (2/12)*100 =16,67%   16.67%
<result>A</result>
A certain car can travel 20 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?