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June 2016 LSAT
Resident: Data indicates that 30 percent of the houses in our town have indaequate site drainage and 30 percent have ...
on November 11, 2019
I thought this was a percent flaw.
on November 12, 2019
You have a point, the flaw in this question is a misuse of percentages. However, it may be a different flaw than you expected. The error in this statement is that it fails to account for houses that have both problems - inadequate drainage and structural defects.
I'll input some numbers to explain.
Let's say there are 100 houses in the town.
Houses with only Structural Defects: 25
Houses with only Inadequate drainage: 25
Houses with both: 5
What percentage of houses have structural defects? 30/100 or 30%
What percentage of houses have inadequate drainage? 30/100 or 30%
What percentage of houses have some kind of problem? 55/100 or 55%
This proves that the conclusion is not necessarily true. It could be less than 60%. The resident in the stimulus assumed that these problems cannot overlap.
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