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Not possible because the unit of room measure is missing.

However, if one assumes (no old jokes please) that the room measurement is referring to feet, as is typically standard in America, one would calculate:

(11 ft * 12 in per ft ) * (12 ft * 12 in per ft) = 19008 in²

18 in * 18 in = 324 in²

19008 in² / 324 in² = 58.666

This means you would need at least fifty-nine (59) 18*18 in tiles to cover the 11*12 ft room.

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Q: How many 18 inch x 18inch tiles would you need for a 11 x 12 room?
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