book Maths Puzzle Numerical Ability

please help me solve this problem:what decimal numberis equal to 12 percent?

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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? I want to know how to do rational and irrational problems.