70% of 7 graders have iPhone and 60%are in chorus. However, 15% of 7th graders are neither in chorus or own phone. What % of students have an iPhone and are not in chorus

Answer 1

We do not know how many have phones and are in the chorus, label that percentage as x and place in the intersection of the two circles.

so we have :
70+60-x+15 = 100
x = 45

now you have all the entries, so what is your answer ?