In a trapezoidal vegetable field, the upper base is 25 meters long, the lower base is 20 meters longer than the upper base, and the height is 20 meters. If 4.2 kilograms of beans are harvested per square meter, how many beans can be harvested in total?
一块梯形菜地，上底长25米，下底比上底长20米，高20米，如果每平方米收豆角4.2千克，一共可以收多少豆角？
<gadget id="calculator">25 + 20 + 25</gadget>
<output>70</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">70 * 10 * 4.2</gadget>
<output>2_940</output>

<result>2_940</result>