An engineering team plans to complete a project with 100 people in 90 days. After 15 days of work as planned, everyone's work efficiency can be increased by 50% due to the adoption of advanced technology. How much can the project be completed in advance?
某工程队计划100人90天完成一项工程，按计划工作15天后，由于采用了先进的技术，每个人的工作效率都可提高50%，完成这项工程可提前多少．
<gadget id="calculator">90 - 15</gadget>
<output>75</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / (3/2)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">75 * (1/3)</gadget>
<output>25</output>

<result>25</result>