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Mathematics, 17.11.2020 06:00 brianmcclain7010

In the morning, Marco sold 12 cups of lemonade for $3. By the end of the day, he had earned $9. How many cups of lemonade did he sell in all? Kaycee wrote the proportion 12/3 =9/c for this situation.
Identify the error and give two ways to write the proportion correctly.

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