Cut a cylindrical steel column with a height of 18 decimeters and a diameter of 6 decimeters at the bottom into a cone of equal base and height, and after cutting off part and melting, how many similar cones can be cast.
把一段高18分米，底面直径是6分米的圆柱体钢柱，切成一个等底等高的圆锥体，切削去部分熔化后，还可以铸成多少个同样的圆锥体．
<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">(2/3) / (1/3)</gadget>
<output>2</output>

<result>2</result>