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%'S [#permalink] New post 10 Dec 2011, 17:55
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Question Stats:

71% (01:49) correct 28% (01:49) wrong based on 7 sessions
In a survey of 150 persons, how many were smokers and drinkers?
(I) 80% of the person surveyed were drinkers
(II) 40% of the smokers were drinkers also
[Reveal] Spoiler: OA
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Concentration: General Management
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Re: %'S [#permalink] New post 12 Dec 2011, 05:02
ashiima wrote:
In a survey of 150 persons, how many were smokers and drinkers?
(I) 80% of the person surveyed were drinkers
(II) 40% of the smokers were drinkers also


We can have a table as below:

drink no drink total
smoke ? = 0.4x x
no smoke
total 120 30 150

stmnt1 - 80% were drinkers = 80% of 150 = 120 but we don't have any info about smokers. hence insuff

stmnt 2 - We do not know the number of smokers so we can't calculate the number of smokers + drinkers. hence insuff

Taking together we know number of drinkers is 120 and 40% of smokers are drinkers as well but no other detail. Hence E
Re: %'S   [#permalink] 12 Dec 2011, 05:02
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