The area of a trapezoid is 100 square decimeters, the sum of its upper and lower bases is 32 meters, what is the height?
一个梯形的面积是100平方分米，它的上下底之和是32米，高是多少．
<gadget id="calculator">32 * 10</gadget>
<output>320</output>

<gadget id="calculator">2 / 320</gadget>
<output>1/160 = around 0.00625</output>

<gadget id="calculator">100 * (1/160)</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>