Paula has a dog that weighs 3 times as much as Carla's dog. The total weight of the dogs is 80 pounds. How much does Paula's dog weigh? Use the diagram to find the weight of Paula's dog.

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.