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Answer:
54 books
Step-by-step explanation:
3/3 - 2/3 = 1/3
Mario then picked up 18 books from the remaining (1/3) books.
We have the equation:
(1/3)x - 18 = 0
(1/3)x = 18
x = 54 books
So, there were 54 books on the shelf to begin with.