The volume of a cylinder is 18 cubic centimeters, how many cubic centimeters should be cut off to form a cone with the same base and height?
一个圆柱的体积是18立方厘米，把它削成一个等底等高的圆锥，应削去多少立方厘米．
<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">18 * (2/3)</gadget>
<output>12</output>

<result>12</result>