Each square meter of forest can release 75 grams of oxygen per day, and how many kilograms of oxygen can be released per day by 120 square meters of forest.
每平方米森林每天能释放氧气75克，120平方米森林每天能释放氧气多少千克．
<gadget id="calculator">120 / 1_000</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">75 * (3/25)</gadget>
<output>9</output>

<result>9</result>