Contoh/ Example 15 (60)
60 = 15 = 4
15 ialah faktor bagi 60.
15 is a factor of 60.
(c) 5 (268)​

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 if ur looking for a ratio it would be 12: 3