One shelf at Cover-to-Cover Bookstore contains copies of several books on the best-seller list. 1/2 of the books on the shelf are copies of the Number 1 best- seller. Of the remainder, 1/4 are copies of the Number 3 book. The rest are copies of the Number 2 book. If there are 5 copies the Number 2 book, how many best sellers are on the shelf?

Answer 1

1/2 + (1/4 * 1/2) = 5/8
So, 3/8 x = 5

I suspect a typo.