Which of the following is a proportion?

a.3/4 = 12/15
b.8/10 = 6/8
c.6/9 = 8/12
d.4/6 = 9/12

Here, out of all options, only option C contains proportional number as their reduced form is equal to 2/3

6/9 = 8/12 = 2/3

In short, Your Answer would be Option C

Hope this helps!

The answers are 20,30,80,180,960,890,1230,4560. on the first row