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| Water, gas, and electricity ： ウィキペディア英語版 |
Three utilities problem
The classical mathematical puzzle known as the three utilities problem; the three cottages problem or sometimes water, gas and electricity can be stated as follows:
The problem is an abstract mathematical puzzle which imposes constraints that would not exist in a practical engineering situation.
==History==
Henry Dudeney states that the problem is "as old as the hills...much older than electric lighting, or even gas"; a review of the problem's history is given by Kullman who states that most published references to the problem characterize it as "very ancient".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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