The principles of reliable problem solving are

applied to an age problem.

The arithmetic and algebraic solutions are shown.

SureMath

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.

Problem contributed by Haroldo C. Branco, 1997