maya packs 26 books on her trip, but the books weigh 87 pounds. she takes out half the books and now her suitcase weighs 47 pounds. how much do half the books weigh. write an equation

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.