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bidan = x
dokter = y
51(x+y) = 45x+60y
51x+51y = 45x+60y
51x-45x = 60y-51y
6x = 9y
2x = 3y
2/3 = y/x
y:x = 2:3
maka
perbandingan dokter dan bidan adalah 2:3