A total of 91 air conditioners need to be installed, and two people can complete the installation within a week. How many units are installed per person per day on average?
一共要安装91台空调，两个人安装一个星期就可以全部完成．平均每人每天安装多少台？
<gadget id="calculator">98 / 7 / 2</gadget>
<output>7</output>

<result>7</result>