Johanna’s mom paid $2.40 for a -pound box of cereal. How much would 1-pound of that cereal cost? Sorry I really don’t understand

Since the box is already a pound, we can determine that $2.40 = 1 pound of cereal!

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.