The sum of the upper and lower bases of a trapezoid is 20cm, and the area is 50cm**2. What is the height of the trapezoid in cm?
一个梯形的上下底之和是20cm，面积是50cm**2．则这个梯形的高是多少cm．
<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 * (1/10)</gadget>
<output>5</output>

<result>5</result>