Honest John says that what he "don't know about milk is scarcely worth mentioning," but he was flabbergasted the other day when he had nothing but two ten-gallon cans of milk, and two customers with a five and a four quart measure wanted two quarts put into each measure.
It is a juggling trick, pure and simple, devoid of trick or device, but it calls for much cleverness to get two exact quarts of milk into those measures employing no other receptacles of any kind except the two measures and the two full cans. You can try the problem with the fullest assurance that it is a legitimate and not a silly catch.
Sam Loyd, Cyclopedia of Puzzles, 1914
see the answer.
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