He needs 12/6=<<12/6=2>>2 rungs per foot

So he needs 50*2=<<50*2=100>>100 rungs

Each rung is 18/12=<<18/12=1.5>>1.5 feet

So he needs 1.5*100=<<1.5*100=150>>150 feet

# Answer

150
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
James wants to build a ladder to climb a very tall tree.  Each rung of the ladder is 18 inches long and they are 6 inches apart.  If he needs to climb 50 feet how many feet of wood will he need for the rungs?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
150
James wants to build a ladder to climb a very tall tree.  Each rung of the ladder is 18 inches long and they are 6 inches apart.  If he needs to climb 50 feet how many feet of wood will he need for the rungs?
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