Answer
Length = 130 m
Work Step by Step
Let width = x
Length = 2x – 10
Perimeter = 400
2(length + width) = 400
2(2x-10 + x) = 400
3x – 10 = 200
3x = 210
x = 70 m
Length = 2(70) – 10 = 130 m
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