Overlapping Sets – Questions Answered Correctly

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If 60 percent of a class answered the first question on a certain test correctly, 60 percent answered the second question on the test correctly, and 60 percent answered both questions correctly, what percent answered neither question correctly?

Review: Overlapping Sets - Questions Answered Correctly


Explanation

We can think of this as an overlapping sets question, drawing a Venn diagram or simply recalling the formula . If we call the total number of students 100, then we have







The correct answer is (D).


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