Duong is organizing a birthday party for his brother. He is ordering his brother's favorite take-out food from a diner that charges for each take-out meal they deliver. There are six family members, including himself, coming to the party. In addition to family, he wants to invite friends. He is not sure if all the friends he invites will come. Duong wants each person to have at least one meal. He is ordering twenty meals from the diner. Let x represent the number of friends Duong will invite. Which of the following will be true?