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Answer to Question #16458 in Abstract Algebra for Joe

Question #16458
Five years ago, Dylan was half as old as Alyssa was then. Ten years from now, Dylan will be as old as Alyssa was five years ago. How old is Alyssa now?
Expert's answer
Let assume that Alyssa now is X years old and Dylan is Y years old:
X-5=2(Y-5)
Y+10=X-5, Y=X-15
X-5=2(X-20)
X-5=2X-40
X=35

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