When Xiao Miao reads a comic book, she reads 10 pages on the first day, and twice as many pages on the second day. How many pages should she read on the third day?
小苗看一本连环画，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>