The side length of a square room is 6 meters. If there are at most 4 people per square meter, how many people can stand in this room?
一间正方形房间的边长为6米，如果每平方米最多站4个人，这间房间最多可以站多少人？
<gadget id="calculator">6 * 6 * 4</gadget>
<output>144</output>

<result>144</result>