Let x and y be the number of ounces present in the large bucket and small bucket, respectively. The system of linear equations that would allow us to answer the problem is,
7x + 5y = 2000
4x + 10y = 2000
The values of x and y from the system are 200 and 120 ounces.
Answer: large bucket = 200 ounces
small bucket = 120 ounces