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 2/5 of the water that it started with? The technician must remove _____ more gallons of water for the tank to have 2/5 of the water that it started with.