book Maths Puzzle Numerical Ability

what is an interger in algebra and can you give me an example?

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I am having more problems i understand now the last one i submitted but i have TWO problems i cant understand
here is one
During one week Dow Jones Industrial average, the most The length of a rectangle is 2cm more than twice its width. If the perimeter of the rectangle is 52cm, find the dimensions of the rectangle.