jj392是GWD原题:18-Q33: If Diana’s stamp collection, of the stamps are Canadian, and of the Canadian stamps were issued before 1940. If 192 stamps in Diana’s collection are Canadian stamps that were issued in 1940 or later, how many stamps in her collection are not Canadian?
A、84 B、88 C、96 D、104 E、112 解答: 因为3/7 是指1940以前,所以4/7才是1940 or later,等于192 stamps. 設邮票总数为X, X*4/5*4/7=192, X=420, not Canadian=> 总数的1/5, 故 答案= 420*1/5=84