The upper base of a trapezoid is 8, the lower base is 18, its area is 286, what is its height?
一个梯形的上底是8，下底是18，它的面积是286，高是多少．
<gadget id="calculator">18 + 8</gadget>
<output>26</output>

<gadget id="calculator">2 / 26</gadget>
<output>1/13 = around 0.076923</output>

<gadget id="calculator">286 * (1/13)</gadget>
<output>22</output>

<result>22</result>