Paul had
80
fliers to post around town. last week, he posted
14
of them. this week, he posted
25
of the remaining fliers. how many fliers has he still not posted?

To find how many filers he still hadn't posted yet, all you've got to do is add the number of fliers he did put up in the two weeks and subtract them from 80 to get how many fliers he has left to put up.

80-14
Subtract
66-25
Subtract again
Final 41

This means that he still has 41 fliers that he still hadn't posted.

Cbottom left is the correct one.