Question 20
Pablo has a certain number of rectangles whose areas add up to $3$ and whose sides are all less than or equal to $1$. Prove that with these rectangles it is possible to cover a square of side $1$ in such a way that the sides of the rectangles are parallel to the sides of the square.
**Note:** The rectangles may overlap and may stick out of the square.
**Note:** The rectangles may overlap and may stick out of the square.