AMC 10 Step by Step
2017 AMC 10BProblem 11P11-15~3 minPrint

At Typico High School, 60%60\% of the students like dancing, and the rest dislike it. Of those who like dancing, 80%80\% say that they like it, and the rest say that they dislike it. Of those who dislike dancing, 90%90\% say that they dislike it, and the rest say that they like it. What fraction of students who say they dislike dancing actually like it?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.