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?
How many rungs does James need? ** He needs 12/6=<<12/6=2>>2 rungs per foot
How many rungs does James need? ** So he needs 50*2=<<50*2=100>>100 rungs
How long is each rung? ** Each rung is 18/12=<<18/12=1.5>>1.5 feet
How many feet of wood will he need for the rungs? ** So he needs 1.5*100=<<1.5*100=150>>150 feet
#### 150