Identical copies of books are being packaged and shipped to a bookstore. There are 18 boxes of books that each weigh 31 pounds. The boxes have space for some more books to be added; however, the total weight of all of the boxes cannot exceed 615 pounds. Two workers, Kevin and Olivia. want to determine how many more pounds of books they can add into each box without going over the weight limit. Kevin wrote the inequality 18(x +31) 615.

Olivia wrote the inequality 18(x +31) s 615.

Who wrote the correct inequality? How many extra pounds can they add to each box?
help only with right answers ​