剩下的一箱货物有多重

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小灵通家的商店里有六箱货物,分别重15、16、18、19、23、31千克,两名顾客买走了其中五箱.已知一名顾客买的货物质量是另一名顾客的2倍,那么商店里剩下的一箱货物重多少千克?
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