The shape of an orchard is approximately trapezoidal. Its upper base is 120 meters, its lower base is 180 meters, and its height is 80 meters. If each fruit tree occupies an area of 10 square meters, how many fruit trees are there in this orchard?
一个果园形状近似梯形，它的上底是120米，下底180米，高是80米，如果每棵果树占地10平方米，这个果园共有多少棵果树？
<gadget id="calculator">120 + 180</gadget>
<output>300</output>

<gadget id="calculator">80 / 2 / 10</gadget>
<output>4</output>

<gadget id="calculator">300 * 4</gadget>
<output>1_200</output>

<result>1_200</result>