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number of books on each shelf at first : 1u
40 x 1u = 40u ——- (40 – 8) x (1u + 25) = 32u + 800
1u ——- 800/(40 – 32) = 100
40 x 100 = 4000

Ans : 4000 books.

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At first, there were 40 shelves with u books on each shelf for a total of 40u books

After 8 shelves were removed,

there were now (40 – 8) = 32 shelves with (u + 25) books on each shelf, for a total of 32 × (u + 25) = (32u + 800) books.

40u = 32u + 800

8u = 800

u = 100

Total number of books -> 40u = 4000

 

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