If you keep 3 rulers, 1, 3, 7,

送交者: 零加一中 2013月01月02日11:27:42 于 [灵机一动] 发送悄悄话

回  答: 砝码是活的，尺子是死的 由 车五进二 于 2013-01-02 11:17:19

it really can measure up to 11. Good idea?

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The problem states one ruler - 车五进二 01/02/13 (18957)

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