You have a shelf that holds 25 1/2 pounds how many 1 1/4 pound books can the shelf hold? explain your response

19 books because you are not going to put 2/5 of a book on the shelf 

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.