They were given a 3-gallon jug and a 5-gallon jug and were asked to fill the 5-gallon jug with exactly 4 gallons.
他们得到了两个分别为3加伦和5加伦的罐子，并要求在5加伦的罐子中准确的装入4加伦。
They were given a 3-gallon jug and a 5-gallon jug and were asked to fill the 5-gallon jug with exactly 4 gallons.
他们得到了两个分别为3加伦和5加伦的罐子，并要求在5加伦的罐子中准确的装入4加伦。
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