Two cylinders and cones with the same base and height have a volume difference of 12.56 cubic decimeters. What is the sum of their volumes?
两个等底等高的圆柱和圆锥，它们的体积相差12.56立方分米，它们的体积和是多少立方分米．
<gadget id="calculator">12.56 * 2</gadget>
<output>25.12</output>

<result>25.12</result>