Answer: More green squares. Also 3 blue squares on the rug.
Explanation:
The question said the rug is a rectangle. There are also 8 squares on the rug. 4 squares are already taken by green squares. Proof of this is in the fraction itself: 4/8. so out of 8 squares, green occupies 4. We now have 4 squares left.
Purple occupies 1/4. That means we now have 3 squares left. Therefore, the remaining 3 squares are blue.
Answer: 3 blue squares.
In fraction terms, blue occupies 3/8ths of the rectangular rug.