Answer:
Fifty Six
Explanation:
As per the question, there are 29 books at the left of 30th book and 32 book at the right of 30th book . If we get the total 29 + 32 + 1, we find it 62. Now we remove 2 books + 4 books, which is 6. From the total 62, if we deduce 6, we get that 56 will be left on the shelf.