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. seven hands go up. then the professor asked everyone with a pierced ear to do likewise. this time there are 36 hands raised. how many students have piercings both on their ears and their noses?​

3 people have both a nose and ear pierced. I deducted this by adding 7 and 36 to see what amount of students go over the 40 count (Because whatever amount of students is more than 40, those are the amount of students who raised their hands twice)

i dont know

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why didnt you study

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