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Charlie has moved between countries and the average income of both has increased. How can this be so?

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What can you see? What do you notice? What questions can you ask?

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Age 14 to 18 Challenge Level:
Think about what the rules are telling you, rather than your intuitive preconceptions about the meaning of some of the words.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
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NRICH is part of the family of activities in the Millennium Mathematics Project.