Answer:
33,991 books
Explanation:
You have a total of 67,982 books. To find 1/3 of that, you divide it by 3.
67,982/3=22,660.66667
The result is the number of children's section books. Now subtract this number from the total number, because "of the remaining books 75% are fiction".
67,982-22,660.66667=45,321.33333
This is the amount of remaining books. Now multiply this number by 0.75, which is 75% in decimal form, because 75% of it is fiction.
45,321.33333*.75=33,991
33,991 books are in the fiction section.