How many meatballs are required for a party of 20 adults and 5 children

It’s very interesting question. If meatballs are big, perhaps you’ll need 25 meatballs for party. But if meatballs are small, let's pretend that one adult will need 3 meatballs and one child will need 2 meatballs, that’s why maybe you’ll need 20*3+5*2 = 60+10=70 meatballs.