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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length plus width equals perimetre
The equation to find the volume of a rectangular object is (a) volume equals length times width times height.
a = L x W: area equals length times the width. p = 2L + 2W: perimeter equals 2 times the length plus 2 times the width so L = (p - 2W)/2
Assuming you mean a rectangle: use the formula:p = 2(l+w) (i.e., perimeter equals twice length plus width). In this formula, replace p with the known perimeter, and l with the given length, then solve for width.
The width is half the length: The perimeter is twice the length plus twice the width. If the perimeter is 3 times the length, twice the width must be the length.