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Difficulty: Tricky Clare and Jeremy just finished a job overseas, on Dough Island. They received the following as payment, in the island’s currency: A $3 coin A $4 coin A $6 note An $8 note and A $9 note. Clare and Jeremy want to share the money so they both get the same number of […]

There are some surprising patterns that can be revealed in Australian coins if you take a closer look.