Cut a piece of cylindrical steel into the largest cone. The weight of this piece of round steel is 12kg. How much does the cut part weigh?
把一段圆柱形的钢材切削成一个最大的圆锥，这段圆钢重量是12kg，切掉部分重多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 * (2/3)</gadget>
<output>8</output>

<result>8</result>