SOLUTION: which formula can i use to find side w,in the formula p=2l+2w?

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Question 32334: which formula can i use to find side w,in the formula p=2l+2w?
Answer by mukhopadhyay(490) About Me  (Show Source):
You can put this solution on YOUR website!
You need to write w in terms of p
p=2l+2w
=> 2w=p-21
=> w = (p-21)/2