再问一道jj题
[size=9pt]Of the 75 houses in a certain community, 48have a patio.How many of the houses inthe community have a swimming pool?[/size][size=9pt][/size]
[size=9pt](1) 38 of the houses in the community have apatio but do not have a swimming pool.[/size][size=9pt] [/size]
[size=9pt](2) The number of houses in the communitythat have a patio and a swimming pool is equal to the number of houses in thecommunity that have neither a swimming pool nor a patio.[/size][size=9pt][/size]
[size=9pt]Ans: B[/size][size=9pt][/size]
答案是B吗？我怎么感觉是C呢? B
根据2，设The number of houses in the communitythat have a patio and a swimming pool 为x, 设the number of houses with swimming pool 为y
则可知75-x=48+Y-x => 可求得Y 27 house
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