There are 10 story books, 3 history books, and 12 popular science books on the bookshelf. Xiao Wang randomly takes a book from the bookshelf. How many different ways are there?
书架上有10本故事书，3本历史书，12本科普读物，小王任意从书架上取一本书，有多少种不同的取法．
<gadget id="calculator">10 + 3 + 12</gadget>
<output>25</output>

<result>25</result>