Betty has 20 books, and her sister has 1/4 times more books than Betty. What's the total number of books the two have?
Betty's sister has 1/4 * 20 books = 
<gadget id="calculator">1/4*20</gadget>
<output>5</output>
5 more books.
The total number of books Betty's sister has is 20 books + 5 books = 
<gadget id="calculator">20+5</gadget>
<output>25</output>
25 books.
The total number of books the two have is 25 books + 20 books = 
<gadget id="calculator">25+20</gadget>
<output>45</output>
45 books.

<result>45</result>