There is a rectangular broad-leaved forest 9 meters long and 6 meters wide. If every square meter of broad-leaved forest can produce 3 kilograms of oxygen per day, how many kilograms of oxygen can this broad-leaved forest produce per day?
有一片长9米，宽6米的长方形阔叶林．如果每平方米的阔叶林每天能制造3千克氧气，那么这片阔叶林每天能制造氧气多少千克？
<gadget id="calculator">9 * 6 * 3</gadget>
<output>162</output>

<result>162</result>