Figure 1 shows a square tile made up of 2 grey squares, H and J and 2 identical white rectangles K. The length of 1 side of square H is twice the length of 1 side of square J.
- What fraction of the square tile in Figure 1 is grey?
- Figure 2 shows a wall laid with square tiles. The wall is 18 m by 18 m and is completed covered with square tiles. Find the total area of the wall covered by grey squares.