A piece of round steel is cut into the largest cone, and the weight of the cut part is 4 kg. How much is the weight of this piece of round steel?
把一段圆钢切削成一个最大的圆锥体，切削掉的部分部分重4千克，这段圆钢重多少千克．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / (2/3)</gadget>
<output>6</output>

<result>6</result>