Answer:
The answer is 50 feet.
Explanation:
Heather is building a ladder for her tree house. She will need 13 feet of lumber for each stilt and 2 feet of lumber for each rung on the ladder.
Now, there are 2 stilts and 12 rungs.
So, for stilts she needs
feet of lumber.
And for 12 rungs, she needs
feet of lumber.
Therefore, in total she needs:
=>
feet
Hence, the answer is 50 feet.