Xiaoling reads an extracurricular book. She read 12 pages on the first day, then read 6 pages more than the previous day every day, and read 48 pages on the last day. How many days did she read in total?
小玲读一本课外书，第一天读了12页，以后每天都比前一天多读6页，最后一天读48页，她一共读了多少天．
<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>