A trapezoidal orchard has an upper base of 160 meters, a lower base of 120 meters, and a height of 90 meters. If each tree covers an area of 9 square meters, how many fruit trees can be planted in this orchard?
一个梯形的果园，上底是160米，下底是120米，高是90米．如果每棵树占地9平方米，那么这个果园可栽果树多少棵？
<gadget id="calculator">160 + 120</gadget>
<output>280</output>

<gadget id="calculator">90 / 2 / 9</gadget>
<output>5</output>

<gadget id="calculator">280 * 5</gadget>
<output>1_400</output>

<result>1_400</result>