Answer:
width=20meters
length=108meters
Explanation:
w=x
l=6x-12
p=2(w+l)
256=2(x+6x-12)
256=2(7x-12)
256=14x-24
256+24=14x
280=14x
x=280/14=20
recall,
l=6*20-12=120-12
l=108
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