Figure 1 shows a square tile made up of 2 grey squares, D and E and 2 identical white rectangles F. The length of 1 side of square D is twice the length of 1 side of square E.
- What fraction of the square tile in Figure 1 is white?
- Figure 2 shows a wall laid with square tiles. The wall is 15 m by 15 m and is completed covered with square tiles. Find the total area of the wall covered by grey squares.