Li Li read an extra-curricular book. She read 10 pages on the first day, then read 6 pages more than the previous day, and finally read 52 pages on the last day. How many days did she read in total?
李丽读一本课外书，第一天读了10页，以后每天比前一天多读6页，最后一天读了52页，她共读了多少天．
<gadget id="calculator">52 - 10</gadget>
<output>42</output>

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>