Of the books standing in a row on a shelf, an atlas is the

Thanks for responding.

On the shelf, the atlas is the 30th book from the left.

1,2,___________29,[30]
There are 29
to the left
of [atlas]

The atlas is (also) the 33rd book from the right

******************[33],32,31_______________2,1
There are 32
books to the right
of [atlas]

There is 1 atlas.

29 + 32 + 1 = 62 books on the shelf. (2 + 4) = 6 books are removed. How many left? 62 - 6 = 56.

For the number (quantity) of books on the shelf, it doesn't matter from where they are taken. There are 62 books and 6 go away. If we were asked about the new n\(^{th}\) place the atlas held from the left or right side or both, then which side they came from, and how many were taken, would matter.

Answer A

Total books: R - L + 1 = 33 + 30 - 1 = 62

6 books are removed: 62 - 6 = 56

Answer A

There are 29 books at the left of 30th book and 32 book at the right of 30th book
so total 29+32 + 1(30th book) = 62-6 (Removing books) = 56
Ans. A

Another way is:
30+33-1(repetition)-6 withdrawn (2 from left+from 4 left)=56
Ans. A

Why adding up the books after the withdrawal doesn't work, please?
I mean, 28+1+29 produces 58, which is apparently a wrong answer choice.