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: Susanna heard some exciting news about a well-known celebrity. Within a day she told 4 friends who hadn't heard the news yet. By the next day each of t...

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