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?
He needs 12/6=
<gadget id="calculator">12/6</gadget>
<output>2</output>
2 rungs per foot.
So he needs 50*2=
<gadget id="calculator">50*2</gadget>
<output>100</output>
100 rungs.
Each rung is 18/12=
<gadget id="calculator">18/12</gadget>
<output>3/2 = around 1.5</output>
1.5 feet.
So he needs 1.5*100=
<gadget id="calculator">1.5*100</gadget>
<output>150</output>
150 feet.

<result>150</result>