Posted by **Thanh** on Wednesday, October 6, 2010 at 11:10pm.

A firefighter stood on the middle rungs of a ladder ,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 ladder .How many rungs did the ladder have?

- math -
**PsyDAG**, Thursday, October 7, 2010 at 1:26pm
Let R = rungs

.5R + 6 - 10 + 18 = R

Solve for R.

- math 4 grade -
**Thanh**, Thursday, October 7, 2010 at 6:28pm
A firefighter stood on the middle rungs of a ladder ,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 ladder .How many rungs did the ladder have ?

Please ,answer clearly because I'm want to explain for my son how to solve the problem.Thanhs a lot.

- math -
**Anonymous**, Wednesday, February 1, 2012 at 9:02am
you are finding how many steps are from the middle to each end of the ladder so you have 2n. next you know the middle step is going to count as 1 so you have the equation 2n + 1

up 6 down 10 up 18

6 - 10 +18 =14

2n + 1

2 (14) + 1

28 + 1

29 steps

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