Dave has 2 buckets that he uses to fill water troughs on his horse farm. he wants to determine how many ounces each bucket holds. On Tuesday,he fills an empty 2000 ounce water trough with 7 large buckets and 5 small buckets of water. On Thursday he fills the same empty water trough with 4 large buckets and 10 small buckets of water. How many ounces does each bucket hold?