A turtle is at the bottom of a 14 foot well. Each day it crawls up 5 feet, but each night it slips back 4 feet. After how many days will the turtle reach the top of the well.

Day Height

0 - 14

1 - 13

2 - 12

3 - 11

4 - 10

5 - 9

6 - 8

7 - 7

8 - 6

9 - 5

10 - 4

11 - 3

12 - 2

13 - 1

14 0

It will take him 14 days

Every day he crawls up + 5 then at night down - 4.

5-4 = 1

So, at the end of every day he goes up 1 foot.