Noah's family also wants to blow up a total of 60 balloons for the party. Yesterday they blew up 24
balloons. Today they want to split the remaining balloons
equally between four family members.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.