The volume of a cone is 16 cubic decimeters. If the height remains the same and the radius of the base is reduced by 2 times, what is the volume of the cone at this time?
一个圆锥的体积是16立方分米，如果高不变，底面半径缩小2倍，这时圆锥的体积是多少立方分米．
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>