Harmony used discarded paper to make notepads for her friends. She would fold five letter size pieces of paper three times then cut along the lines. She would then stack the smaller note papers and staple them together. How long would one notepad last if someone wrote ten notes per day? 1 piece of paper=1 note

First fold of a piece of paper produces two smaller pieces of paper
Second fold of the resulting pieces of paper produces 4 smaller pieces of paper.
Third fold of the resulting pieces of paper produces 8 smaller pieces of paper.

Thus, the five letter size pieces of paper folded three times produces 8 x 5 = 40 notes.

Thus, one notepad consists of 40 notes.

If someone wrote ten notes per day, then one notepad will last for 4 days.