When Xiao Fang reads a book, he has already read 136 pages, and the rest reads 15 pages a day, which takes 18 days to finish. How many pages does this book have?
小方看一本书，已经看了136页，剩下的每天看15页，18天看完．这本书一共有多少页？
<gadget id="calculator">15 * 18</gadget>
<output>270</output>

<gadget id="calculator">270 + 136</gadget>
<output>406</output>

<result>406</result>