A13.5 gallon gasoline tank is 4/5 full. how many gallons will it take to fill the tank?

4/5 is equal to 0.8.    0.8 x 13.5= 10.8     13.5 - 10.8 = 2.7
2.7 GALLONS ARE NEEDED TO FILL THE TANK

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct