The square is divided into 3 colors: red, yellow, & blue, as shown. The 4 congruent yellow squares are enclosed by the big red cross and 4 congruent blue L-shapes. On the other hand, the 4 congruent yellow rectangles on the edge have the same width as the yellow square but the length twice as long.

Which color has the most area?

Blue.
All of them have the same area.
Red.
Yellow.

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From the picture above, when we divide the big square into $6\times 6$ smaller squares, each unit square has an equal area to the yellow square because its side length is a half of the blue and a quarter to the red.

By counting these unit blocks, we can see that the red cross-shaped area has 12 unit squares. Each corner blue area has 3 squares, so the total blue area also equals to 12 unit squares. Finally, the 4 edge yellow areas equal to 8 unit squares, so when combined with the overlapping 4 squares, the total yellow area also equals to 12 unit squares.

Hence, all 3 colors have the same area.