This question cannot be answered as it stands. Meters and square meters are different in that one is length and the other area.
To answer this, you would need to specify the dimensions of the wood that you are using to cover the floor. If you are using 5cm wide strips of wood, then you would need 20m^2 / .05m = 400 linear meters of wood strips.
Then add 10% for cuts,knots and mistakes.
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The Louvre is approximately 60,600 square meters.
Skin usually covers about 2 square meters.
As a linear meter is a length with zero width, even with an infinite number of them they will not cover an area of 30 square meters.
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7 sq meters