Sarah feeds her fish every 2 days and her pet snake every 6 days. in 30 days, how many times will sarah feed her fish and snake on the same day?

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.

Ithink it is15not sure tho