For a food drive, jack collected three cans of food of eight neighbors. his goal is thirty cans of food. how many more cans does he need?

If jack already has three cans and needs total thirty
Cans he has= 3
Cans needed in total = 30
Therefore, cans left to collect = 30-3=27

(Also when seeing a question, u should not get confused by all the data given. Usually the extra data is given to confuse the person reading the question . Just look at what the question asks and then use the data accordingly. Example here the number of Neighbours are unnecessary yet is confuses the reader. Hope this helps.)

With a continuous thought process.