Ricardo has a marble collection with 54 blue marbles, 24 red marbles, and 18 yellow marbles. he arranges the marbles into equal rows. the marbles in each row will be the same color. how many marbles can he put in one row?

The answer is 6 because it is the only number other than 2 that u can divide all of these numbers by... I would assume that your teacher wouldn't take 2 as an answer. 6/54=9
6/24=4
6/18=3

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.