The upper base of a trapezoidal apple orchard is 75 meters, the lower base is 90 meters, and the height is 80 meters. If each apple tree covers an area of 12 square meters, how many apple trees can be planted in this apple orchard?
一个梯形苹果园的上底是75米，下底是90米，高是80米．如果每棵苹果树占地12平方米，这个苹果园可栽苹果树多少棵？
<gadget id="calculator">75 + 90</gadget>
<output>165</output>

<gadget id="calculator">80 / 2 / 12</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">165 * (10/3)</gadget>
<output>550</output>

<result>550</result>