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uang andi = a
uang bondan = b
uang chandra = c
a+b+c = 43.000
a:b = 5:4
b:c = 3:4
a : b : c = 5 : 4
3 : 4
a : b : c = 15 : 12 : 16
15x + 12x + 16x = 43000
43x = 43000
x = 1000
uang bondan = 12000