In a book, after Xiaoli has read 32 pages, there are 18 pages left. How many pages are there in this book? (solution by equation)
一本书，小莉看了32页后，还剩18页，这本书共多少页？(用方程解)
<gadget id="calculator">18 + 32</gadget>
<output>50</output>

<result>50</result>