A trapezoidal orchard has an area of 600 square meters, its upper base is 23 meters, and its lower base is 17 meters. How many meters is its height?
一个梯形的果园，它的面积是600平方米，它的上底是23米，下底是17米，高是多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">23 * (1/2)</gadget>
<output>23/2 = around 11.5</output>

<gadget id="calculator">17 * (1/2)</gadget>
<output>17/2 = around 8.5</output>

<gadget id="calculator">(23/2) + (17/2)</gadget>
<output>20</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<result>30</result>