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Presumably 300 is the perimeter if so then let length be x and the width be 20x:

2(length+width) = perimeter

2(x+20x) = 300

2x+40x = 300

42x = 300

x = about 7.142857143 units

20x = about 142.857429 units

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Q: Length plus 20 times width equals 300?
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