A cylinder and a cone with the same base and height, the volume of the cone is 30 cubic decimeters less than the volume of the cylinder, what is the volume of the cylinder?
等底等高的圆柱和圆锥，圆锥的体积比圆柱的体积少30立方分米，圆柱的体积是多少立方分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 / (2/3)</gadget>
<output>45</output>

<result>45</result>