Riddle: Die Hard With A Vengeance Riddles: You are given a 5-gallon jug and a 3-gallon jug in front of a fountain. Measure out exactly 4 gallons of water.
Answer: Fill up the 3-gallon tank and pour it into the 5, refill the 3 gallons again and top off the 5. This leaves 1 gallon left in the 3-gallon tank.
Dump out the 5-gallon tank and pour it in the 1 gallon. fill up the 3-gallon tank completely again and pour it into the 5 to make 4.