Stage: 3 Challenge Level: 
Congratulations to Alice who sent in a correct solution to this problem:
Congratulations to Ray who also worked on this problem and sent us the following result:
Calculating with fractions. Algebraic fractions. Creating expressions/formulae. Visualising. Algebra - generally. Patterned numbers. Fractions. Mathematical reasoning & proof. smartphone. Generalising.
Published October 2005.
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