Solution: Science and technology books account for 6 of 1, story books account for 5 of 12, and reference books account for 24 of 3.

1 in 6.

=(6×4) point (1×4)

= 4 out of 24

12 may

=( 12×2) per minute (5×2)

= 10/24

From March 24th < April 24th <10/24th.

Get 3/24 < 1 < 65438+5/02.

That is to say, there are the most story books and the least reference books.