What is the value of y in the parallelogram below

The sum of any two adjacent angles of a parallelogram is 180° ⇒
angle adjacent to 64° = 180 - 64 = 116° 

In a parallelogram opposite angles are equal ⇒

4y + 12 = 116
4y = 116 - 12
4y = 104
y = 104/4
y = 26  ← answer.

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.