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The sum of two number is 25 and their difference is 13. Find their product.

Answer» Let the numbers be x and y. Then, x + y = 25 and x - y = 13. 4xy = (x + y)2 - (x- y)2    = (25)2 - (13)2    = (625 - 169)    = 456 xy = 114.


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