2. 一个公司的人要么有business certificate 要么会French 要么两者兼有。 business certificate有40% French有80% 求一个比例people who have business certificate also can speak French. (注意问的方式,非常肯定答案没有20%的选项 还好没有,不然我就选了) A 10% B30% C50% D60% E80% 选C
两个都会的是80+40-100=20% people who have business certificate also can speak French 就是 20%/40%=50%
2. 一个公司的人要么有business certificate 要么会French 要么两者兼有。 business certificate有40% French有80% 求一个比例people who have business certificate also can speak French. (注意问的方式,非常肯定答案没有20%的选项 还好没有,不然我就选了) A 10% B30% C50% D60% E80% 选C