Write a simplified ratio 10 ounces to 5 pounds

It would be 2:1 because first, it was 10:5 then you would simplify it by dividing it by 5. You would get 2:1

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.