Which ratios form a proportion?

Question

3/15, 12/55
8/24, 12/35
5/18, 25/90••
4/11, 16/25

Which ratio form a proportion with 9/15?

6/10
16/21
36/50••
45/70

Answer 1

1. yes
2. no

Answer 2

I'm really sure it's B

Answer 3

Correct me

Answer 4

Hold on I'm really sure it's A not B

Answer 5

A is right.

9/15 = 3/5 = 6/10

Answer 6

Is 4/5 and 36/50 form a proportion