Answer:
Rickey keep 2/3 or 0.7 fudge.
Step-by-step explanation:
Consider the provided information.
John made of a pound of fudge and Mary made of a pound of fudge.
Ricky takes the sum of the two amounts of fudge
The sum of the two amounts of fudge is 2 pound.
He divides it into three equal portions.

Hence Rickey keep 2/3 or 0.7 fudge.