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At a birthday party,half the guests drink cola,a quarter hav

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At a birthday party,half the guests drink cola,a quarter have lemonade,a sixth have orange
juice,and the remaining three have water.
在一次生日派对上,一半的来宾喝可乐,四分之一喝柠檬汁,六分之一喝橘子汁,剩下的喝水.
再问: 答案呢
再答: x(1-1/2-1/4-1/6)=3 x=36