How many meat balls are required for a party of 10 adults and 5 children

The formula for this is m = 4a + 2c, where c = number of children; m = number of meatballs; a = number of adults.

m = (4 x 10) + (2 x 5)

simplify,

40 + 10 = 40

The answer to this is 40 meatballs.