Phil has 10 books that are all 100 pages each.  He moves to a new home and during the move, 2 books are lost.  How many pages worth of books does Phil have left?
Phil starts with 10 books and loses 2, for 10-2=
<gadget id="calculator">10-2</gadget>
<output>8</output>
8 books.
Each of Phil's remaining books has 100 pages, so he has 8*100= 
<gadget id="calculator">8*100</gadget>
<output>800</output>
800 pages worth of books.

<result>800</result>