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L : P = 11 ; 17
banyak perempuan = 110 orng
dit : banyak laki2 ?
dijawab :
Jmlh siswa = (11+17)/17 x 110
= 28/17 x 110
= 181 orng
banyak laki2 = 11/28 x 181
= 71 orng