Answer:
50 meters
Explanation:
Width is x
So length will be x + 20
Perimeter = 2 (W + L) = 2 (x + x + 20) = 2 (2x + 20) = 4x + 40
so 4x + 40 = 160
4x = 120
x = 30
so length = x + 20 = 30 + 20 = 50
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