Sam owns 28% of partnership.
Explanation:
Given,
David owns 24% of a partnership.
Robert owns 48% of the partnership.
To find the partnership of Sam.
Let, total partnership is 100
Then, David owns = 24
Robert owns = 48
Total partnership they both own = (24+48) = 72
So,
Sam own = 100 - 72 = 28
Hence,
Sam owns 28% of partnership.