5/5 because 7/8-2/3 equals 5/5 what you are doing you are taking away you take away 2 from the 7 and take away 3 from the 8 so there is your anwser 5/5 hope this helped! :D
The answer is 52% because there is a total of 25 marbles and if you add the red and blue marbles you get 14 which is more than the green mables which is more than half the amount of the total marbles