Question

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Answer 1

20

Explanation:

first we find the area of ​​the horizontal rectangle, (the one above), then we find the area of ​​the square, from the area of ​​the square we subtract the area of ​​the rectangle and we have the area of ​​the vertical rectangle (the one below, with the inverse formula we find the side and add the side of the rectangle above, and we will have that x = 20 ( see the figure)