exam Maths Puzzle Numerical Ability

I'm going to guess this would be the correct place for this. I need to solve something called 'the oldest geometry proof. There is a diagram. I will try to explain it. There is

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A financial advisor suggests to a client that she invest part of her portfolio in municipal bonds earning 6.5% annual simple interest, and the remainder in corporate bonds earning A rectangle picture measures 12 inches by 15 inches. A border of uniform width is to be constructed around the outside of the picture so that the area of the border is the same as the area of the picture. What should be the width of the border?