Find the value of w if a=lw,
a=16m^2
l=8m
w=?

So if A=LW
and A=16m^2
and L=8m
A=LW
16m^2=8m(W)
divide both sides by 8m
2m=W

or you could convert the equation A=LW to A/L=W to solve for W
so A/L=W  or (16m^2)/8m=W
cancel out one 'm'  (16m)/8=W
simplify the fraction 2m/1=W
2m=W

The correct answer is 10%