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Voli = 37,5%
Kasti = 20% = 18 orang
Bola = 100% - (12,5+37,5+20)% = 100%-70% = 30%
20% ~ 18 orang
30% ~ y orang
20y = 18*30 = 540
y = 540/20 = 27 orang
jadi peserta ekskul bola ada 27 orang