kathy stood on middle rung of a ladder, she climbed up 5 rungs, than climbed down 2 rungs, climbed up 9 more rungs, and finally climbed last 4 rungs to top. How many rungs in the ladder?
If she is in the middle of the latter just count how many rungs there are above the middle that will be the same number of rungs there are below the middle.
