A cylinder and a cone have the same base and height, the sum of their volumes is 120 cubic centimeters, what is the difference in volume in cubic centimetres?
一个圆柱和一个圆锥等底等高，它们体积的和是120立方厘米，体积的差是多少立方厘米．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

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

<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<result>60</result>