Bunuel wrote:
SOLUTION
If 75 percent of the guests at a certain banquet ordered dessert, what percent of the guests ordered coffee?
Assume there were 100 guests on the banquet. So we have that 75 of them ordered dessert.
(1) 60 percent of the guests who ordered dessert also ordered coffee --> 0.6*75=45 guests ordered both dessert AND coffee, but we still don't know how many guests ordered coffee. Not sufficient.
(2) 90 percent of the guests who ordered coffee also ordered dessert --> 0.9*(coffee)
...
.jpg)
