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(150)(x) + (152)(12) / (x + 12) = 150,8
(150x + 1824) = (x + 12) 150,8
150x + 1824 = 150,8x + 1809,6
150,8x - 150x = 1824 - 1809,6
0,8x = 14,4
8x = 144
x = 144/8
x = 18 siswa perempuan
semoga bisa membantu!!! terima kasih