At a sale, a shoe store sold 8 pairs of shoes for a total of $256. each pair cost the same amount. what was the price of each pair of shoes?

Easy, 256÷8=32, so $32 per shoe

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.