book Maths Puzzle Numerical Ability

I have a hard time figuring word problems, can someone please help?

A garden area is 30 feet long and 20 feet wide. A path of uniform width is set around the edge. If the remaining garden area is 400 feet squared, what is the width of the path?

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Hello I have tryed this many was and am unclear as to how to do it.

The length of a rectangular playing field is 5 ft less than twice its width. if the perimeter of the playing field is 230 ft find the lenght and the width of the field. please help me solve this problem:what decimal numberis equal to 12 percent?