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Re: DS from Kaplan [#permalink]
28 Aug 2007, 09:10
In a certain city the ratio of the numbr of people who purchase newspaper X to the numb of people who purchases newspaper Y is 7:1. What percent of the population purchases newspaper Y?
(1) 27% of population purchases neither newspaper X nor newspaper Y. (2) 70% of the people wo purchase newspaper Y also purchase newspaper X.
(1) 27% of population purchases neither newspaper X nor newspaper Y. sufficient 73*1/8
2) not Sufficient
could somebody check this please? my initial answer was also (A), but the kaplan solution says it is not sufficient since the ratio does not include the percentage of population reading BOTH newspapers... so their answer is (C).
does the "ratio rule" (i.e. 73*1/8) perhaps only work when there is no overlap of two things??