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Verified answer
Misal : x= laki", y= perempuaanmodel matematika
x+y = 400
160.000x + 120.000y = 57.200.000
_____________________________: 10.000
16x + 12y = 5.720
_____________:4
4x+3y = 1430
jadi
x+y = 400 (x3)
4x+3y = 1430(x1)
3x+3y= 1200
4x+3y = 1430
____________-
-x=-130
x=130
maka diketahui jumlah pekerja laki" adalah 130
jumlah pekerja perempuan = 400-130= 270
maaf kalo salah
160.000L + 120.000W = 57.200.000
16L + 12W = 5.720
16(400 - W) + 12W = 5.720
6.400 - 16W + 12W = 5.720
-16W + 12W = 5.720 - 6.400
-4W = -680
W = 170 orang