Xiao Miao read a 105-page book, read 10 pages on the first day, and read 3 times as many pages on the second day as the first day.
小苗看一本105页的书，第一天看了10页，第二天看的页数是第一天的3倍，第三应从多少看起．
<gadget id="calculator">105 * 3</gadget>
<output>315</output>

<gadget id="calculator">105 + 315 + 1</gadget>
<output>421</output>

<result>421</result>