Xiaoxin reads a book, he reads 12 pages every day, half of the book is read in 8 days. After that, he read 4 more pages every day than before. How many days did it take to finish reading this book?
小欣读一本书，他每天读12页，8天读了全书的一半．此后他每天比原来多读4页．读完这本书一共用了多少天？
<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<gadget id="calculator">96 / 16</gadget>
<output>6</output>

<gadget id="calculator">6 + 8</gadget>
<output>14</output>

<result>14</result>