Question 758680
1/2 - 1/8 = 3/8
Therefore 3/8 = 9 galls
           1 full tank = 9*8/3
           1 full tank = 24 gallons
1/8 of 24 galls = 3 gallons
So, 3 gallons in initially
9 gallons added to 1/2 mark
12 gallons require to be added to
the tank to fill it.
Hope this helps.
:-)