Answer:
750 books
Explanation:
10% .............75 books
100% .............x books
x = 100×75/10 = 7500/10 = 750 books
750 books are present in total.
if 75 books is 10%
then
(75*10) AND (10% * 10)
would be equal to
750 books that comprise of the 100% of the library 4.
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