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 for this situation. Identify the error and give two ways to write the proportion correctly.

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 proporti class=