trapezoidal tea garden with an upper base of 24 meters, a lower base of 30 meters and a height of 18 meters. If each tea tree occupies an average area of 0.5 square meters, how many tea trees can be planted in this tea garden?
一个梯形茶园，上底24米，下底30米，高18米．如果平均每棵茶树占地0.5平方米，这个茶园一共可载树多少棵茶树？
<gadget id="calculator">24 + 30</gadget>
<output>54</output>

<gadget id="calculator">18 / 2 / 0.5</gadget>
<output>18</output>

<gadget id="calculator">54 * 18</gadget>
<output>972</output>

<result>972</result>