The area of a trapezoid is 40m**2, the sum of the upper and lower bases is 16m, what is the height?
一个梯形的面积是40m**2，上底与下底的和是16m，高是多少．
<gadget id="calculator">2 / 16</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<result>5</result>