A cylinder and a cone have the same base diameter and height. It is known that the sum of their volumes is 16 cubic decimeters. How many cubic decimeters is the volume of the cone?
一个圆柱和一个圆锥，它们的底面直径和高都相等，已知它们的体积和是16立方分米，圆锥的体积是多少立方分米？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<result>4</result>