Mingming borrowed a book from the school library, started reading 12 pages a day, and only read half of the book in 10 days. In order to return the book on time, I have to read 3 more pages a day, and how many days will it take to finish it?
明明从学校图书室借了一本书，开始每天看12页，10天只看了全书的一半，为了能按时还书，以后每天要多看3页，还要几天看完？
<gadget id="calculator">12 * 10</gadget>
<output>120</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">120 / 15</gadget>
<output>8</output>

<result>8</result>