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The fifth and sixth grade libraries
First, I borrowed 840x25%=2 10 books in the fourth grade.

The remaining 840-2 10=630 was distributed to the fifth and sixth grades.

Suppose there are X books in grade five and 630-x books in grade six.

Then x/(630-x)=5/4.

The solution is x=350.

So I borrowed 350 books in the fifth grade and 280 books in the sixth grade.

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