bookshelf

[ASMAA997]

A bookshelf holds both paperback and hardcover books. The ratio of paperback books to hardcover books is 22 to 3. How many paperback books are on the shelf?

(1) The number of books on the shelf is between 202 and 247, inclusive.

(2) If 18 paperback books were removed from the shelf and replaced with 18 hardcover books, the resulting ratio of paperback books to hardcover books on the shelf would be 4 to 1

My questions are :
at # 2:
when I solve :
( x-18)/(y+18)= 4/1

then , x-18=4 then x= 22
y+18=1 then y= 17 .

1- Is this way of solving right ?

because in the book they used another approach and the results are different .

[RonPurewal]

you wrote:

in the book they used another approach and the results are different

this folder is strictly for problems from the FREE GMAT Prep software from mba.com.
if there is a "book" that contains "other approaches" to these problems, then, this thread has been posted in the wrong folder.

please post this problem in the correct folder, with a citation of the original source.

thank you.