Ou Ou reads a story book "Journey to the East", reads 6 pages a day, and reads half of the book in 10 days. Later, he read 2 more pages every day than the previous day, and read 16 pages in the last day, so how many days will it take him to finish the book.
欧欧看一本《东游记》故事书，每天看6页，10天看了这本书的一半．后来他每天都比前一天多看2页，最后一天看了16页，那么他要看完这本书，一共需要多少天．
<gadget id="calculator">16 - 6</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<result>15</result>