A trapezoidal wheat field has an upper base of 110 meters, a lower base of 240 meters, and a height of 120 meters, with a total harvest of 15.12 tons of wheat. How many tons of wheat are harvested on average per hectare?
一块梯形麦田，上底是110米，下底是240米，高120米，一共收小麦15.12吨．平均每公顷收小麦多少吨？
<gadget id="calculator">110 + 240</gadget>
<output>350</output>

<gadget id="calculator">120 / 2 / 10_000</gadget>
<output>3/500 = around 0.006</output>

<gadget id="calculator">350 * (3/500)</gadget>
<output>21/10 = around 2.1</output>

<gadget id="calculator">15.12 / (21/10)</gadget>
<output>7.2</output>

<result>7.2</result>