An orchard is approximately trapezoidal, with an upper base of 200 meters, a lower base of 160 meters, and a height of 180 meters. If one fruit tree is planted every 5 square meters, how many fruit trees are planted in this orchard?
一个果园，近似于梯形，上底是200米，下底是160米，高是180米．如果每5平方米种一棵果树，这个果园一共种多少棵果树？
<gadget id="calculator">200 + 160</gadget>
<output>360</output>

<gadget id="calculator">180 / 2 / 5</gadget>
<output>18</output>

<gadget id="calculator">360 * 18</gadget>
<output>6_480</output>

<result>6_480</result>