The chemical fertilizer factory produces a batch of chemical fertilizers. The original plan is to produce 180 tons per day, which takes 12 days to complete. If the production efficiency increased by 20%. How many days in advance can this batch of production tasks be completed?
化肥厂生产一批化肥，原计划每天生产180吨，12天完成．如果生产效率提高20%．可提前几天完成这批生产任务？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(1/12) * (6/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<result>2</result>