Each shelf of a bookcase contains 20 books. If the librarian took out 38 books and rearranged the remaining books so that all shelves but the last one contained 16 books and the last shelf contained 22 books, how many shelves does the bookcase have?	Pick one:
A) A)11	B) B)15	C) C)16	D) D)12	E) E)13
Denoting x the number of the shelves,   we can build an equation: 20x=16(x−1)+22+38   Solving the equation, we get x=11   11nswer: 11
<result>A</result>
Each shelf of a bookcase contains 20 books. If the librarian took out 38 books and rearranged the remaining books so that all shelves but the last one contained 16 books and the last shelf contained 22 books, how many shelves does the bookcase have?