Final answer:
To find the cost of a carton of eggs, divide the total cost by the number of cartons. Multiply the cost of one carton by the number of cartons to calculate the total cost.
Step-by-step explanation:
Mathematics - Middle School:
To find the cost of a carton of eggs, we divide the total cost by the number of cartons. In this case, we divide $22.20 by 12 to get $1.85. This means that a carton of eggs costs $1.85.
To calculate the total cost of 7 cartons, we multiply the cost of one carton by the number of cartons. So, we multiply $1.85 by 7 to get $12.95.