Verified Answer :

mercedesrial

15 because if you divide 45 from 3 (indicating there is more boys) youll get 15 i hope this is right and it helps

Setor9

There were 15 girls.
Set a system of equation x=girl and y=boy
So x+y=45
2x=y
if you solve you'll get x=15 And y=30

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