Melisa baked 84 cookies. After giving some cookies to Molly and Jean, she had of her cookies left. On average, how many cookies did Molly and Jean each receive?
Average = sum of the parts ÷ number of parts
Sum of the parts = number of cookies Molly and Jean received altogether
Number of parts = Molly and Jean = 2
The number of cookies Melissa had left: 84 × 1/3 = 28 cookies
The number of cookies Molly and Jean received: 84 28 = 56 cookies
Therefore, the average each friend received: 56 ÷ 2 = 28 cookies