弱弱的问一道题

Which of the following is equal to (2¹² – 2⁶)
/ (2⁶ – 2³)?

A.   
2⁶ + 2³

B.    
2⁶ - 2³

C.    
2⁹

D.   
2³

E.    
2

先谢了

Of the students in a certain school, 15 percent are enrolled
in an art class and 10 percent are enrolled in a music class.  What percent of the students in the school
are enrolled in neither an art class nor a music class?

(1)   2/3 of the students who are enrolled in an
art class are also enrolled in a music class.

(2)
          There are more than 100
students in the school.