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To find the area of the shaded part, we first need to find the total area of the rectangle and then subtract the area of the two boxes.
Total area of the rectangle = height x width = 11 cm x 18 cm = 198 cm²
Area of the first box = height x width = 4 cm x 5 cm = 20 cm²
Area of the second box = height x width = 2 cm x 5 cm = 10 cm²
Total area of the shaded part = Total area of the rectangle - Area of the first box - Area of the second box
= 198 cm² - 20 cm² - 10 cm²
= 168 cm²
Therefore, the area of the shaded part is 168 cm².