A project was originally planned to be completed by 36 people, and it would take 17 days to complete. After working for 3 days, it was decided to complete it 2 days ahead of schedule. How many more people are needed?
一项工程原计划由36人做，要17天完成，工作3天后，决定要提前2天完成，需要增加多少人？
<gadget id="calculator">36 * 17</gadget>
<output>612</output>

<gadget id="calculator">36 * 3</gadget>
<output>108</output>

<gadget id="calculator">612 - 108</gadget>
<output>504</output>

<gadget id="calculator">17 - 3 - 2</gadget>
<output>12</output>

<gadget id="calculator">504 / 12</gadget>
<output>42</output>

<gadget id="calculator">42 - 36</gadget>
<output>6</output>

<result>6</result>