1 foot = 12 inches. So, 420 inches = 420 / 12 = 35 feet.
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19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).
420 inches = 11.6666667 yards
420 inches=35 feet
420 centimeters = 165.354331 inches
420 centimeters is equal to 166.007905 inches