A trapezoidal wheat field, the upper base is 35m, the lower base is 25m, the area is 1140m**2, how many meters is the height?
一块梯形麦田，上底是35m，下底是25m，面积是1140m**2，高是多少米？
<gadget id="calculator">35 + 25</gadget>
<output>60</output>

<gadget id="calculator">2 / 60</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1_140 * (1/30)</gadget>
<output>38</output>

<result>38</result>