Joel divided 68 cd evenly on 4 shelves aphabetical the first containing the letters A-E. If there are 13 under A-D how many are filed under the letter E

4 CDs filed under E

Step-by-step explanation:

Find how many CDs are there per shelf.

68/4 = 17

1 shelf = 17

We do not know how many are in E so we use the total CDs in the section plus E

13+x = 17

Subtract 13 by both sides

(13-13) + x = 17-13

x = 4