Xiaoqiang reads a cartoon book. On the first day, he read half of the book and 5 pages. On the second day, he read the remaining half and 12 pages. He didn’t read 8 pages. How many pages are there in this cartoon book?
小强看一本卡通书，第一天看了这本书的一半又5页，第二天看了余下的一半又12页，还有8页没看，问这本卡通书共有多少页．
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 + 5</gadget>
<output>45</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<result>90</result>