A trapezoidal wheat field has an upper base of 280 meters, a lower base of 320 meters, and a height of 150 meters. Calculated by harvesting 5 tons of wheat per hectare, how many tons of wheat can be harvested from this wheat field?
一块梯形麦田上底为280米，下底为320米，高150米．按每公顷收获5吨小麦计算，这块麦地共能收获多少吨小麦？
<gadget id="calculator">280 + 320</gadget>
<output>600</output>

<gadget id="calculator">150 / 2 / 10_000</gadget>
<output>3/400 = around 0.0075</output>

<gadget id="calculator">600 * (3/400) * 5</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>