Ronaldo shared 2 1/2 sandwiches with his family.
To find out, you can multiply the total number of sandwiches Ronaldo has by 3/4:
3 3/7 * 3/4 = 24/28 * 3/4 = 72/112 = 18/28 = 9/14
Then simplify 9/14 to a mixed number:
9/14 = 0 9/14 = 0 3/7
So Ronaldo shared 2 1/2 sandwiches with his family.