Answer: 9072
Step-by-step explanation:
It seems that the number of cans that grades 1 and 2 collect are irrelevant in the problem so you can basically ignore that. Grades 3 and 4 have 6683 cans which is 2389 cans less than grades 5 and 6 so that means grades 5 and 6 have 2389 cans more than 6683. Now you just add 6683 and 2389 to find the cans that grades 5 and 6 have.
6683 + 2389 = 9072
Grades 5 and 6 have 9072 cans
(there are a few typos is the problem and this is my first time answering so I'm really sorry if I got this wrong)
