Answer: 16:15
Step-by-step explanation: Yes, I know some might think that it should be 15:16. But that is not the case, it is 16:15 because it asks GIRLS to BOYS not BOYS to GIRLS. TIP: when trying to find the ration, pay CLOSE ATTENTION to what group comes first.
Example: Boys to Girls; Horses to Cows; etc.......
I hope this helps! See ya!