Algebra | Find The Width of a Frame

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Find the width of a universal frame, given the perimeter of the frame and the dimensions of the photo

Perimeter of frame = 72 in
Dimensions of the picture = 12x20 in
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THANK YOU SO MUCH! I was going insane on a similar math problem and was so confused on what to do.

mut
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Thanks
I solved it in diffrnet way

The diffrnece between both frama is

72-(12+12+20+20)=72-64=8


Now
Individe the diffrnec by 8
I get answer 1

I divide by 8 because thie euqte to eight sides of 4 outer corners

I hope it makes sense

suraprod