A field of corn is 40 meters long and 25 meters wide. The output of 1 square meter is about 3 kilograms. How many kilograms of corn can be harvested from this corn field?
一片玉米地长40米，宽25米．1平方米的产量大约是3千克，这片玉米地大约能收获玉米多少千克？
<gadget id="calculator">40 * 25 * 3</gadget>
<output>3_000</output>

<result>3_000</result>