The two sisters typed a manuscript. After the elder sister worked alone for 8 days, there were still 180 pages left to be typed, and the younger sister continued to work alone for 5 days to complete the task. It is known that the younger sister types 4 pages less than the older sister every day, how many pages did the older sister type when completing the task?
姐妹二人打一份稿件，姐姐先单独工作8天后，还剩下180页没打完，妹妹接着单独工作5天完成任务．已知妹妹每天比姐姐少打4页，完成任务时姐姐打了多少页？
<gadget id="calculator">180 / 5</gadget>
<output>36</output>

<gadget id="calculator">36 + 4</gadget>
<output>40</output>

<gadget id="calculator">40 * 8</gadget>
<output>320</output>

<result>320</result>