Acookie recipe calls for 2 1/2 cups of sugar for every 2/5 cup of flour. if you made a batch of cookies using 1 cup of flour how many cups of sugar would you need?

solve for "x"

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.