After cutting a cylinder into the largest cone, the volume is reduced by 1.2 cubic decimeters. What is the original volume of the cylinder.
把一个圆柱体切削成一个最大的圆锥后，体积减少了1.2立方分米．圆柱体原来的体积是多少．
<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">1.2 / (2/3)</gadget>
<output>1.8</output>

<result>1.8</result>