The shape of a peach garden is trapezoid, its upper base is 120 meters, its lower base is 160 meters, and its height is 20 meters. If each peach tree covers an area of 8 square meters, how many peach trees are planted in this peach garden?
一个桃园的形状是梯形，它的上底是120米，下底是160米，高是20米．如果每棵桃树占地8平方米，那么这个桃园里共栽桃树多少棵？
<gadget id="calculator">120 + 160</gadget>
<output>280</output>

<gadget id="calculator">20 / 2 / 8</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">280 * (5/4)</gadget>
<output>350</output>

<result>350</result>