A cylindrical billet with a base area of 78.5 square centimeters and a height of 20 centimeters is cut into a cone with the largest volume. What is the remaining volume?
把一个底面积是78.5平方厘米，高是20厘米的圆柱体钢坯切削成一个体积最大的圆锥．剩下的体积是多少？
<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">78.5 * 20 * (2/3)</gadget>
<output>1_046.666667</output>

<result>1_046.666667</result>