21-ft x 3-ft = 63 ft2
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1yd = 3ft 1 sq yd = 1yd x 1yd = 3ft x 3ft = 9 sq ft 1 sq ft costs 2.75, => 1 sq yd which is 9 sq ft costs 9 x 2.75 = 24.75
1 sq yd = 1yd * 1yd = 3ft * 3ft = 9 sq ft So 160 sq ft = 160/9 sq yds = 17.778 sq yds
21 ft * 10 ft = 210 sq ft = 19.51 sq metres.
21 ft * 6 ft = 126 sq ft = 11.7 sq metres approx.
1 sq foot = 0.0929030 sq metre