If the radius of the base of a cone is twice the radius of the base of a cylinder, and the ratio of the height of the cylinder to the height of the cone is 4:5, then the volume of the cone is equal to the volume of the cylinder.
一个圆锥的底面半径是一个圆柱底面半径的2倍，圆柱的高与圆锥高的比是4：5，那么圆锥的体积是圆柱体积的多少．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>