if 1 is subtracted from numerator and denominator of a fraction the value of 33 1 upon 2 if 1 is added to its numerator and denominator the value is 2.3 find the fraction

How do you do this geometry problem

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Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?