width ---- x m
length ---- x+30
320 < 2x + 2(x+30) < 360
320 < 4x + 60 < 360
260 < 4x < 300
65 < x < 75
your are building a soccer field. the length has to be 30 m longer than the width, and the total perimeter must be between 320i m and 360 m.
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