Question: Lori needed 1 whole egg to make 2 deviled egg halves.  She anticipates that each of her guests will eat 3 deviled egg halves.  If she is inviting 16 guests to her party, how many dozens of eggs will she need?
Answer: 
She is inviting 16 guests that will eat 3 deviled egg halves each so she needs 16*3 =48 halves
1 whole egg is needed to make 2 halves so 48 halves is 48/2 = 24 whole eggs
1 dozen is equal to 12 and she needs 24 eggs so she needs 24/12 = 2 dozen eggs