Acollection of 36 coins consists of nickels, dimes, and quarters. there are three fewer quarters than nickels, and six more dimes than quarters. how many of each kind of coin?

I’d say letter a..

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.