The area of a trapezoid is 200 square centimeters, the height is 20 centimeters, the upper base is 6 cm, what is the lower base?
一个梯形的面积是200平方厘米，高是20厘米，上底是6厘米，下底是多少．
<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * (1/10)</gadget>
<output>20</output>

<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<result>14</result>