At east school each of the 45 classrooms have an average of 22 students at west school each of the 42 classrooms have an average of 23 students how many more students at are at east school then west school

East= 45 x 22 = 990 students
west= 42 x 23 = 996 students
996 - 990 = 6 students
990 - 996 = -6 students

There are 6 more students at West school than East school. There are -6 more students at East school than West school.

Hope it helps!

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.