Question

One shelf at Cover-to-Cover Bookstore contains copies of several books on the best-seller list. Half 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

n on shelf

.5 n are #1

.25 * .5 n = .125 n are #3

.5 n + .125 n = .625 n are either #1 or #3
so
1 n-.625 n = .375 n = 5

n = 5/.375 = 13 1/3

hmmmm, I hope we have a fractional bookcase

Answer 2

THANKS A MILLION!

Answer 3

You are welcome.