A piece of round steel is cut into the largest cone, and the weight of the cut part is 6 kg. What is the weight of this piece of round steel before cutting.
把一段圆钢削成一个最大的圆锥体，削掉的部分重6千克，这段圆钢末削前重多少千克．
<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">6 / (2/3)</gadget>
<output>9</output>

<result>9</result>