Answer
Please see the work below.
Work Step by Step
We know that
$3.0lb=(3.0)(0.454Kg)=1.362Kg$
$2100ft^2=(2100)(9.290\times 10^{-2}m^2)=195.09m^2$
Now $Coverage=\frac{195.09m^2}{1.362Kg}=143\frac{m^2}{Kg}$
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