Elena bought 8 tokens for $4.40. At this rate: How many tokens could she buy with $6.05?

Logical equivalent of the give question is its contrapositive

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.