I assume the measurement is in inches (it would have been helpful to say, because the measurement is vital!). So these are 2ft x2ft=4sq ft. 120 sq ft divided by 4 sq ft is 30 tiles. If the shape of the 120 sq ft is something odd like 7.5ft x 16ft etc there is a lot of awkward cutting to do, and in some cases there will be wastage, so think ahead, you may need more.
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120"*120" is 14400 sq. in. 15"*15" is 225 sq. in 14400/225=64 tiles..
A 12x24 tile is 2 square feet. There are 120 tiles that would be needed.
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