Given that "Jonathan and his two friends want to share 2 1/2 pounds of gum ball. If they share the gum ball evenly"
"Jonathan and his two friends" means there are total 3 persons in which we have to distribute gum ball.
Since we have to share gum ball evenly so that means we need to divide 2 1/2 pound by 3
so let's divide that.

Hence each of them will get
pounds of the gum ball.