A cuboid lead block whose length, width, and height are 9 cm, 7 cm, and 3 cm respectively, and a cube lead block whose edge length is 5 cm are melted and cast into a cone. The diameter of the bottom surface of the cone is 20 cm. Find its high.
把一个长、宽、高分别是9厘米、7厘米、3厘米的长方体铅块和一个棱长是5厘米的正方体铅块熔铸成一个圆锥体，圆锥体的底面直径是20厘米，求它的高．
<gadget id="calculator">9 * 7 * 3</gadget>
<output>189</output>

<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<gadget id="calculator">189 + 125</gadget>
<output>314</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">314 / (1/3) / 314</gadget>
<output>3</output>

<result>3</result>