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Camping with Water

The Puzzler


RAY: Here's how you would do it. You take the seven-gallon container and you fill it up and you pour the contents of it into the 13-gallon jug. And then you do that again. And when you do that…

TOM: It's not all going to fit.

RAY: It's not all going to fit. You'll have filled the 13-gallon container, and you will have one gallon left over in the seven-gallon container.

TOM: Right.

RAY: You put that aside. You pour out the 13-gallon container. So now you have one gallon in the seven-gallon container, and the 13-gallon container is empty. You then take that one gallon and you pour it into the 13-gallon container, leaving room for 12 more gallons. You then fill the seven-gallon container again and pour the entire seven gallons into the 13 gallon container.

TOM: Now you're up to eight in there.

RAY: Now you're up to eight gallons, and you say, "Mmm. Eight. Room for how many more?"

TOM: Five.

RAY: Five. You then fill the seven-gallon container and you pour all but two gallons in, because there's only room for five in the 13-gallon container.

TOM: And you'll have two gallons left.

RAY: You'll have two gallons left, and if you don't trip and fall on the way back to the cabin, they'll be able to make the pancakes. So who’s our winner?

TOM: This week’s winner is Margaret Lowe from Minot, North Dakota. Congratulations!

[ Car Talk Puzzler ]

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