To process a batch of 39,600 coats, 30 people completed 13,200 coats in 10 days, and the rest were completed within 15 days. How many more people should be added?
加工一批39600件的大衣，30个人10天完成了13200件，其余的要求在15天内完成，要增加多少人．
<gadget id="calculator">39_600 - 13_200</gadget>
<output>26_400</output>

<gadget id="calculator">13_200 / 30 / 10</gadget>
<output>44</output>

<gadget id="calculator">44 * 15</gadget>
<output>660</output>

<gadget id="calculator">26_400 / 660</gadget>
<output>40</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<result>10</result>