The principles of reliable problem solving are
applied to an age problem.
The arithmetic and algebraic solutions are shown.

the math software for 21st century problem solving
was used to solve this problem.

Arithmetic solution

Algebraic solution

Please comment. Comments are appreciated and
contribute very much to developing
the problem solutions.
Contribute to developing problem solving literacy.

The problem solution was developed by
Howard C. McAllister
using SureMath.

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Problem contributed by Haroldo C. Branco, 1997