Let x represent any year after the year that Attila died.
Attila the Hun died in the year A.D 453. Because x represents the year that goes beyond the year of Attila's death, it cannot be equal to 453. It must be more than 453.
The Answer is 312 -- this is because, as we want know the total amount of cans, you add 5 + 3 which gives you 8.yoy can then times that by the members (39) to give you 312 which is the total