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Coffee or dessert? [#permalink]
16 Aug 2010, 11:40

00:00

A

B

C

D

E

Difficulty:

65% (hard)

Question Stats:

57% (02:18) correct
43% (01:34) wrong based on 46 sessions

What is the fastest way to solve this question? The solution in the OG takes too much time.

If 75 percent of the guests at a certain banquet ordered dessert, what percent of the guests ordered coffee? (1) 60 percent of the guests who ordered dessert also ordered coffee. (2) 90 percent of the guests who ordered coffee also ordered dessert.

Re: Coffee or dessert? [#permalink]
16 Aug 2010, 12:33

From 2 , c/x = 25, doesn't make sense... Perhaps we are assuming that each ordered D or C. That is perhaps an incorrect assumption... In which case, we will need both the equations to solve for C and X

X = .75X + C - 0.6 x 0.75X + N X = 0.75X + C - 0.9C + N

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