A project was planned to be completed in 7 days, but it was actually completed 1 day ahead of schedule. How much work efficiency has been improved?
一项工程计划7天完成，实际提前1天完成，工作效率提高了多少
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/6) - (1/7)</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">(1/42) / (1/7)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>