----------------------------------------------------------------------------------------------------------------------- 6. -.."3 poinlsHunoerDMZ 2.2.011. In a class of 30 students, everyone has either a pieroed 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 me there are 25 hands raised. How manv students have piercings both on their ears and their noses