The volume difference between a cylinder and a cone with the same base and height is 6.9 cubic decimeters, what is the volume of the cylinder in cubic decimeters?
等底等高的圆柱和圆锥的体积相差6.9立方分米，圆柱的体积是多少立方分米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6.9 / (2/3)</gadget>
<output>10.35</output>

<result>10.35</result>