Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. A city water tank holds 20 gallons of water. A technician empties 25% of the tank. How many more gallons of water must be removed from the tank so that it has of the water that it started with?
The technician must remove

more gallons of water for the tank to have of the water that it started with.