Every 20 square meters of woods can absorb 80g of harmful gases in the air every year. A 3300 square meter forest belt is built in a community. How many kilograms of harmful gases can be absorbed in a year?
每20㎡的树林每年可以吸收空气中的有害气体80g，某小区造了一条3300㎡的林带，一年可以吸收多少千克有害气体？
<gadget id="calculator">80 / 20</gadget>
<output>4</output>

<gadget id="calculator">3_300 / 1_000</gadget>
<output>33/10 = around 3.3</output>

<gadget id="calculator">4 * (33/10)</gadget>
<output>66/5 = around 13.2</output>

<result>66/5 = around 13.2</result>