Barbecue maths is interesting, if you find the correct equations let me know. In our house there are 2 adults, and one 8 year old girl. I overestimate on my sums because there are complaints if there are, as in your example, no leftovers. So 9 portions of Greek chicken, 12 sausages, 3 steaks done. There were then 6 sausages, 1 steak and 5 pieces of chicken left by later in the evening.
Subtracting one adult out of the equation (me, because I didn't eat them), this morning, there were no leftovers. How were the remains divided?
Show your working in the margin please.