To build a canal, it is planned to build 84 meters per day, which can be completed in 34 days, but the result is 102 meters per day, how many days can it be completed in advance?
修一条水渠，计划每天修84米，34天可以完成，结果每天修102米，可以提前几天完成？
<gadget id="calculator">34 / 102</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">84 * (1/3)</gadget>
<output>28</output>

<gadget id="calculator">34 - 28</gadget>
<output>6</output>

<result>6</result>