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2000a + 3000b = 1.260.000
2000a + 2000b = 1.080.000
2000a + 3000b = 1.260.000
1000b = 180.000
b = 180
a + b = 540
a + 180 = 540
a = 540 - 180
a = 360
jadi balita terdapat 360 dan dewasa 180