The rice field per square meter can produce 680 kilograms of rice. A trapezoidal rice field has an upper base of 17 meters, a lower base of 8 meters, and a height of 7 meters. How many kilograms of rice can this rice field produce?
每平方米稻田产稻谷680千克，一块梯形稻田，上底是17米，下底是8米，高7米，这块稻田可产稻谷多少千克？
<gadget id="calculator">17 + 8</gadget>
<output>25</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">25 * (7/2) * 680</gadget>
<output>59_500</output>

<result>59_500</result>