The area of the trapezoid is 120 square centimeters, the upper base is 8 cm, the lower base is 12 cm, and the height is in cm.
梯形的面积是120平方厘米，上底是8厘米，下底是12厘米，高是多少厘米．
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">120 * (1/10)</gadget>
<output>12</output>

<result>12</result>