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no .of tiles = area of room /area of tiles

area of room = 9 X12 X12 X12 inches ( 1 foot =12 inches )

area of tiles =3 X8

no.0f tiles =9 X12 X12 X12 inches /3 X 8

=648

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Q: How many 3 x 8 inch tiles do you need to cover a 9 x 12 foot room?
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