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Baffling Brother

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Author: Steve Risberg
Description: teacher support active problem Algebra, difficulty level 2. Brandon wows his sister by having her choose a secret number and make a series of calculations, then telling her what her final answer is. Can you use variables and algebra to explain how Brandon did it?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=3508
Support page: http://mathforum.org/pow/support/algpow/20050912alg.teacher.html
Solution page: Problem #3508

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