It cost $35 for one adult and two children to attend a show. it cost $60 for two adults and three children to attend the same show. how much dose it cost one adult to attend the show?

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.