If the radius of the base of a cylinder is twice the radius of the base of a cone and their heights are equal, then how many times the volume of the cylinder is the volume of the cone.
一个圆柱的底面半径是一个圆锥底面半径的2倍，它们的高相等，则这个圆柱的体积是这个圆锥体积的多少倍．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 / (1/3)</gadget>
<output>12</output>

<result>12</result>