Answer: Neither, the two classes have the same amount of telescopes.
Step-by-step explanation:
ANN = 9 telescopes / 21 students
DEB = 12 telescopes / 28 students
Times Ann's ratio by 1/3 (basically dividing by 3)
9(1/3) / 21(1/3 = 3/7
Times Deb's ratio by 1/4 (diving by 4)
12(1/4) / 28(1/4) = 3/7
Since they are the same, neither class has more telescopes. Again, hope this is right and if not sorry.