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Let's assume that the number of books Jess can put in the box is x.
She has already placed a container in the box weighing 26 lb. Each book she places weighs 1.3 lb.
Hence, the total weight of the books placed in the box is 1.3x.
According to the problem, the box can hold at most 65 lb. So, we can write the inequality:
1.3x + 26 ≤ 65
Simplifying the inequality:
1.3x ≤ 65 - 26
1.3x ≤ 39
To find the maximum number of books Jess can put in the box, divide both sides of the inequality by 1.3:
x ≤ 39 / 1.3
x ≤ 30
The solution to the inequality is x ≤ 30.
Therefore, Jess can put at most 30 books in the box.