A project was originally planned to be completed by 10 people in 8 days. If it is to be completed 3 days ahead of schedule, how many people need to be added? (Solve with ratio)
一项工程，原计划10人8天完成，如果要提前3天完成，需要增加多少人？(用比例解)
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">80 - 80</gadget>
<output>0</output>

<gadget id="calculator">30 + 0</gadget>
<output>30</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>