• Choice E
    15. In the figure below, all of the small squares are equal in area, and the area of rectangle ABCD is 1 square unit. Which of the following expressions represents the area, in square units, of the shaded region?

    Let each side of small squares be k:

    Area of rectangle region = $$6k\cdot8k=1\Rightarrow k^2=\frac{1}{6\cdot8}$$

    Therefore, area of shaded region = $$7k\cdot5k = 7\cdot5\cdot k^2=\frac{7\cdot5}{8\cdot6}$$

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