Is 1/3 bigger than 33.3%

No it is the same value.

1/3 when converted into a percentage is equivalent to 33.3% and since we are comparing 1/3 to 33.3% then they have the same value

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.