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OpenStudy (anonymous):
In a class of 40 students, everyone has either a pierced nose or a pierced ear. The professor asks everyone with a pierced nose to raise his or her hand. Nine hands go up. Then the professor asked everyone with a pierced ear to do likewise. This time there are 33 hands raised. How many students have piercings both on their ears and their noses?
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OpenStudy (anonymous):
whatever 33 + 9 - 40 is
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