You're hosting a weekend barbecue and need to pick up ground meat for burgers. You're expecting 5 couples to come, and a few of them are bringing their kids, 4 children in all. From experience, you know you'll need about 1/2 pound of meat for each adult, and 1/3 pound for each kid. How much meat do you need to buy? Don't forget to include yourself, your spouse, and your pesky 6-year-old twins!