Answer: Here you need to add the total cans that they collected in each entrance; it is 15682 cans + 18940 cans + 16115 cans + 12468 cans = 63205 total cans collected.
So at the end they collected more cans than desired, they wanted 50000 and got 63205, so if you do a difference, 63205 - 50000 = 13205
We can see that they collected 13205 more cans than desired.