Answer :

2 / 4 = 1 / 2 = 9 / 18 ;
2 / 9 = 4 / 18 ;
9 > 4 ;
9 / 18 > 4 / 18 ;
Then, 2 / 4 > 2 / 9 .

2/9=8/36
2/4=18/36


2/4 is bigger!