Xiaoxiao looked at a story book with 150 pages in total, and she had already read 90 pages. She will read the remaining pages within 6 days, how many pages per day on average?
笑笑看一本故事书共150页，她已经看了90页．剩下的页数，她要在6天内看完，平均每天看多少页？
<gadget id="calculator">150 - 90</gadget>
<output>60</output>

<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<result>10</result>