The computer company needs to install 715 computers, 31 of which have already been installed, and the remaining 57 are installed every day. How many days will it take to finish the installation?
电脑公司要装715台电脑，已经装了31台，剩下的每天装57台，还要几天才能装完？
<gadget id="calculator">715 - 31</gadget>
<output>684</output>

<gadget id="calculator">684 / 57</gadget>
<output>12</output>

<result>12</result>