Mr. Somers had twenty pieces of mental that were all the same length. If each piece of mental was 3 ⅕ inches long and he put then side by side, what would be the total length of all the pieces together?

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.