[求助]关于3月JJ406的答案。。

uspresident

这道题，怎么都作不明白。。31号就考g了。。

哪位前辈帮帮忙吧。。小女子这厢有理了。。。

406. In a restaurant, 75% of the customers ordered dessert, what percent of the customers ordered coffee?

1) 93% of the customers who ordered dessert also ordered coffee

2) 80% of the customers who ordered coffee also ordered dessert

选C《--------为啥呢？？？？？

braveMBA

同75） In a restaurant, 75% of the customers ordered dessert, what percent of the customers ordered coffee?

1) 93% of the customers who ordered dessert also ordered coffee

2) 80% of the customers who ordered coffee also ordered dessert

(Figures above may not be 100% accurate)

答案：C

解释：同时order了coffee又order了dessert的顾客群和同时order了dessert又order了coffee的顾客群其实是同一群人，数量相同

75%*93%=80%*y, y=87.2%