The sum of the volumes of a cone and a cylinder with the same base and height is 25.12 cubic decimeters. What is the volume of the cone?
一个圆锥和一个与它等底等高的圆柱的体积之和是25.12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">25.12 / 4</gadget>
<output>6.28</output>

<result>6.28</result>