spraying water on a burning house.

He then climbed up 6 rungs

before the heat of the flames caused him to come down 10 rungs.

After some minutes he was able to climb 18 rungs

to the very top of the ladder.

How many rungs did the ladder have?

#### Click here for Answer

29 rungsThe firefighter is standing on the middle rung.

He goes up 6 rungs so he is now at M+6,

He now goes down 10 rungs so he is now at M-4

He now goes up 18 rungs and reaches the top

So from the middle he goes 14 rungs to top.

So 14 rungs from the top, 14 rungs from the bottom and the middle rung.

14+14+1=29!