Answer: 1,260 books are due back this week.
Explanation:
So, 12500/5 = 2500
2500 * 2 = 5000
5000 is 2/5 out of 12,500
19000/5 = 3800
3800 * 2 = 7600
7600 is 2/5 out of 19000.
7600 + 5000 = 12,600
12600 total books are checked out.
12600/10 = 1260
1260 * 1 = 1260