Master Wang plans to produce a batch of parts, 90 parts per day, which will take 12 days to complete. As a result, 18 more than the original plan were produced every day, how many days can it be completed in advance?
王师傅计划生产一批零件，每天生产90个，12天才能完成．结果每天比原计划多生产18个，可以提前几天完成？
<gadget id="calculator">90 + 18</gadget>
<output>108</output>

<gadget id="calculator">12 / 108</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">90 * (1/9)</gadget>
<output>10</output>

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

<result>2</result>