A trapezoidal orchard has an upper base of 27m, a lower base of 108m, and a height of 18m. One fruit tree is planted every 9 square meters. How many fruit trees are planted in this orchard?
一个梯形果园，上底27m，下底108m，高18m，每9㎡栽果树一棵，这个果园栽果树多少棵？
<gadget id="calculator">27 + 108</gadget>
<output>135</output>

<gadget id="calculator">18 / 2 / 9</gadget>
<output>1</output>

<gadget id="calculator">135 * 1</gadget>
<output>135</output>

<result>135</result>