Xiaopang reads a 180-page book, and reads an average of 14 pages a day for 5 consecutive days. How many pages are short of half of the book?
小胖看一本180页的书，平均每天看14页，连续看了5天，离这本书的一半还差多少页？
<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">14 * 5</gadget>
<output>70</output>

<gadget id="calculator">90 - 70</gadget>
<output>20</output>

<result>20</result>