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= 3 / 20 x a = 12
= a = 12 x 20/3
a = jumlah siswa = 80 siswa
kegiatan ekstrakurikuler yang diikuti 16 anak = b/360° x 80 = 16
b/9° x 2 = 16
b/9° = 8
b = 72°
jadi, kegiatan ekstrakurikuler yang diikuti 16 anak adalah b. voli