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





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  • By: guest on 01 Jun 2017 05.48 pm
    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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