When the side length of a square increases by five centimeters, the area of the square increases by 225 square centimeters. What is the area of the original square? Don't make equations, write out how to answer in detail (because XXX, so 5 + 6 = 11), and don't miss a step. Because I will take the exam in half an hour, the sooner the better!

(225-5*5)/2/5=20
20*20=400

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