Xiao Miao reads a 105-page comic book, 10 pages on the first day, twice as many pages on the second day, and how many pages should be read on the third day.
小苗看一本105页的连环画，第一天看10页，第二天看的页数是第一天的2倍，第三天应从第多少页看起．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">10 + 20 + 1</gadget>
<output>31</output>

<result>31</result>