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Answer:
Width = 18 cm
Lenght = 54 cm
Step-by-step explanation:
L = 3W
P = 2L + 2W
The perimeter of a rectangle:
144 = 2 (3W) + 2W
144 = 8W
144/8 = W
W = 18
L = 3W = 3(18) = 54
I hope this help you