A cylinder and a cone, the radius of the base of the cylinder is twice that of the cone, and the height of the cylinder is (1/2) that of the cone. If the volume of the cone is 15 cubic decimeters, what is the volume of the cylinder?
一个圆柱与圆锥，圆柱的底面半径是圆锥的2倍，圆柱的高是圆锥的(1/2)．如果圆锥的体积是15立方分米，那么圆柱的体积是多少？
<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>