cone and a cylinder have the same base area and height, and the sum of their volumes is 120 cubic decimeters. What is the volume of the cylinder?
一个圆锥和一个圆柱底面积和高都相等，它们的体积之和为120立方分米，圆柱的体积是多少立方分米．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>