Sonja made 20 hamburgers. each hamburger contained pound of ground beef. how much ground beef did sonja use to make the hamburgers? a. 4 pounds b. 5 pounds c. 10 pounds d. 80 pounds

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.