text: Yes M has the 3 gallon jug , and Z the 5 gallon jug:\n\nM fills his jug up and pours it into Zs, so Z has 3 in his jug.\nM fills his jug up again, and then fills Zs jug up, but this leaves 1 gallon in Ms jug since it only takes 2 more to fill up Zs jug. Now Z dumps his jug, and M puts the gallon he has into Zs jug, so Z has a gallon in his jug. Then M fills his jug up again and pours it into Zs, so Z now has 1+3 =4 gallons in his jug.\n Now they celebrate: M gets a gallon of pure alcohol and pours it into Zs jug so they have 5 gallons of hooch, and then they make some calls and have a party. End of story