George has a weight of 500 N, which his half of his fathers weight. He, his father and his uncle sit on a see-saw. If both George and his father sit on the right end of the see-saw, 5 m from the pivot, and his uncles weight is same as his fathers, where should Georges uncle sit in order to achieve a state of balance?

• A. 7.5 m from the pivot, on the left end
• B. 7.5 m from the pivot, on the right end
• C. 5 m from the pivot, on the left end
• D. 5 m from the pivot, on the right end