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Area of each tile = 20*20 = 400 sq inches.

Area of room = 185*123 = 22755 sq inches.

So minimum number of tile required = Roundup(22755/400) = 57.

However, this number assumes that all offcuts are used and that there are no breakages. In real life neither assumption is realistic.

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Q: How many 20X20 inch tiles are needed for a 185X123 inch room?
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