A trapezoidal piece of land has an upper base of 120 meters, a lower base of 180 meters, and a height of 100 meters. If one fruit tree is planted every 5 square meters, how many trees are planted in this land?
一块梯形的土地，上底120米，下底180米，高100米，如果每5平方米种一棵果树，这块地共种多少棵？
<gadget id="calculator">120 + 180</gadget>
<output>300</output>

<gadget id="calculator">100 / 2 / 5</gadget>
<output>10</output>

<gadget id="calculator">300 * 10</gadget>
<output>3_000</output>

<result>3_000</result>