The area of a trapezoid is 1200 square meters. If its upper base is 25 meters and the lower base is 55 meters, what is its height?
一个梯形的面积是1200平方米，如果它的上底是25米，下底是55米，高是多少．
<gadget id="calculator">25 + 55</gadget>
<output>80</output>

<gadget id="calculator">2 / 80</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1_200 * (1/40)</gadget>
<output>30</output>

<result>30</result>