Answer:
6:10 is the only ratio equivalent to 3:5
Explanation:
its not the first one because 5 goes into 30 6 times and 3*6=18 not 13
4:15 isn't possible either because 5 goes into 15 3 times and 3*3=9 not 4
the last one is correct because 3*2=6 and 5*2=10