Answer:
A=l*w
area=length * width
l=length
w=width
given=A=7938m*m&w=81m
required=l
solution=
A =l*w
l=A÷w
l=7938m*m÷81m
m will cancel m
so 7938m÷81
l=98m
checking
A=98m*81m=7938m*m
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