Which set of ratios below is not equivalent to 3:4?

6 to 9, 9/12

9 to 12, 15/20

15/20, 24:32?

Step-by-step explanation:

3:4 is the same as 3/4

6 to 9 = 6/9 = 2/3 <== = this is not equivalent

9/12 = 3/4 ... equivalent

9 to 12 = 9/12 = 3/4 ... equivalent

15/20 = 3/4 ... equivalent

24:32 = 24/32 = 3/4 ... equivalent