First of all, the information given in the question does not entitle you to assume that the room is rectangular. The room I an in now is an irregular octagon: it is basically a rectangle with a trapezium shaped bay window.
Even if you assume it is rectangular, the area of the room does not provide enough information.
Let L be any number greater than (or equal to) 10. And let B = 100/L.
Then a room which is L ft x B ft has an area of L*(100/L) = 100 square feet.
Since the choice of L is arbitrary there are infinitely many choices for L and so infinitely many possible answers to the question.
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100
Floor = 100 square feetCeiling = 100 square feetWalls = we can't calculate the walls without knowing the height of the ceiling
The question is mis-specified. You ask for the area but give the dimensions for volume.
Assuming the room is a square..., sqrt(100) = 10 feet per side ============
The answer will vary from one country to another.