A trapezoidal orchard has an upper base of 170 meters, a lower base of 150 meters, and a height of 60 meters. If each tree covers an area of 10 square meters, how many fruit trees are there in this orchard?
一个梯形果园，它的上底是170米，下底是150米，高是60米．如果每棵树占地10平方米，这个果园有多少棵果树？
<gadget id="calculator">170 + 150</gadget>
<output>320</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">320 * 30</gadget>
<output>9_600</output>

<gadget id="calculator">9_600 / 10</gadget>
<output>960</output>

<result>960</result>