The shape of the land occupied by an orchard is trapezoidal. Its upper base is 180 meters, its lower base is 160 meters, and its height is 50 meters. If each fruit tree covers an area of 0.5 square meters, how many fruit trees are there in this orchard?
一个果园所占土地的形状是梯形．它的上底是180米，下底是160米，高是50米．如果每棵果树占地0.5平方米，这个果园一共有果树多少棵？
<gadget id="calculator">160 + 180</gadget>
<output>340</output>

<gadget id="calculator">50 / 2 / 0.5</gadget>
<output>50</output>

<gadget id="calculator">340 * 50</gadget>
<output>17_000</output>

<result>17_000</result>