(You forgot to add the question, but I guess you want to know the mass of the turkey for 14 people :p ) By hypothesis, 1 lb = 450g. Adam wants that each of the 14 person, get 3/4 lb. Let x be the mass of 3/4 lb in grams, using the rule of three:
1 lb --> 450g 3/4 lb --> x
x = 3/4 * 450 = 337.5 So 3/4 lb = 337.5 g
Adam wants to cook for 14 people and wants to allow 3/4 lb of turkey for each person, so 337.5 for each. So to know the total mass of the turkey, you multiply the mass for one person by the total number of people: 337.5 * 14 = 4725 So the mass of the turkey for 14 people is 4725g, or 10.5 lb (3/4 * 14)
You get this because whenever there are three digits after a number you add a comma as seen in the number there are three digits after 85 so you add a comma.
