A triangular rice field has a base length of 42 meters and a height of 25 meters. The average yield of rice per square meter is 1.2 kilograms. How many kilograms of rice can be harvested in this rice field?
一块三角形稻田，底长42米，高25米，平均每平方米收稻谷1.2千克，这块稻田可收稻谷多少千克？
<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">42 * (25/2)</gadget>
<output>525</output>

<gadget id="calculator">1.2 * 525</gadget>
<output>630</output>

<result>630</result>