Answer:
The length is 22.5 and the width is 19.5
Explanation:
2L + 2W = P
\/
2L + 2W = 84
W + 3 + W + 3 + W + W= 84
4W + 6 = 84
4W = 78
W = 19.5 L = 19.5 + 3 = 22.5
I hope this helps, have a nice day! :D
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