Cut a section of cylindrical steel into the largest cone, and the cut part weighs 12 kg. How many kilograms does the original steel weigh?
把一段圆柱形钢材削成一个最大的圆锥体，切掉的部分重12千克，求原钢材重多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 / (2/3)</gadget>
<output>18</output>

<result>18</result>