Three rugs have a combined area of 90 m². When they are laid down to cover completely a floor of area 60 m², the area which is covered by exactly two layers of rug is 12 m². What is the area of floor covered by exactly three layers of rug?
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2 m²
6 m²
9 m²
10 m²
12 m²
Select an option, then submit.
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