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Die Hard Challenge (from Maths Digest) – Help Zeus and John get 4 gallons of water!

October25
The Script.
Simon> On the fountain, there should be 2 jugs, do you see them? A 5 gallon and a 3 gallon. Fill one of the jug with exactly 4 gallons of water and place it on the scale and the timer will stop. You must be precise, one ounce of more or less will result in detonation. If you’re still alive in 5 minutes, we’ll
speak.
John> Wait, wait a second. I don’t get it. Do you get it?
Zeus> No.
John> Get the jugs. Obviously, we can’t fill the 3-gallon jug with 4 gallons of water.
Zeus> Obviously.
John> All right. I know, here we go. We fill the 3-gallon jug exactly to the top, right?
Zeus> Huhuhu.
John> Okay, now. We pour this 3 gallons into the 5-gallon jug. Given us exactly 3 gallons in the 5-gallon jug, right?
Zeus> Right, then what?
John> All right. We take the 3-gallon jug and fill it at the 3rd of the way…
Zeus> No, he said: Be precise. Exactly 4 gallons.
John> Every cop within 50 miles is running his ass off and I’m out here playing kids games in the park. 
Can you help John and Zeus solve this “kids game” and prevent a catastrophe?
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