The Telecommunications Bureau currently has 600 users who have applied for installing telephones. In addition, there are 20 new users who are waiting to be installed every day. At least several installation teams need to be arranged by the bureau to install at the same time?
电信局现有600个已申请装电话机的用户，此外每天有20个新申请的用户也待装机，若每个安装小组每天装机10户，要在5天内装完所有待装用户，则电信局至少需要安排几个安装小组同时安装？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">600 + 100</gadget>
<output>700</output>

<gadget id="calculator">700 / 5</gadget>
<output>140</output>

<gadget id="calculator">140 / 10</gadget>
<output>14</output>

<result>14</result>