The area of a trapezoid is 40 square centimeters, the sum of the upper and lower bases is 16 centimeters, what is the height?
一个梯形的面积是40平方厘米，上底和下底的和是16厘米，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>