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This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: In $1983$ the composition of pennies in the United States was changed due, in part, to the rising cost of copper. Pennies minted after 1983 weigh $2.50...
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