An orchard is approximately trapezoidal, with an upper base of 120m, a lower base of 180m, and a height of 60m. If each fruit tree covers an area of 10m**2, how many fruit trees are there in this orchard?
一个果园近似梯形，它的上底120m，下底180m，高60m．如果每棵果树占地10m**2，这个果园共有果树多少棵？
<gadget id="calculator">120 + 180</gadget>
<output>300</output>

<gadget id="calculator">60 / 2 / 10</gadget>
<output>3</output>

<gadget id="calculator">300 * 3</gadget>
<output>900</output>

<result>900</result>