Each shelf of a bookcase contained 11 books. If the librarian took out 30 books and rearranged the remaining books so that all shelves but the last one contained 7 books and that last shelf contained 5 books, how many shelves does the bookcase have?	Choose the correct choice from the following:
A) 5	B) 6	C) 7	D) 8	E) 9
Let x be the number of shelves.   11x - 30 = 7(x-1) + 5   4x = 28   x = 7   The answer is 7.
<result>C</result>
Each shelf of a bookcase contained 11 books. If the librarian took out 30 books and rearranged the remaining books so that all shelves but the last one contained 7 books and that last shelf contained 5 books, how many shelves does the bookcase have?