The birdwatching club has 30 members, 21 girls and 9 boys. what is te ratio of girls to boys in the birdwatching club?

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540

the answer is a if my teacher taught me correct