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maka:
x+(x+10.000)+(x+20.000)+(x+30.000)+(x+40.000)=200.000
5x+100.000=200.000
5x=100.000
x=20.000
jika uang anak ke-5 =20.000
maka uang anak ke-3 = 20.000+20.000
yaitu= 40.000
x+y=z.3
200rb-z=200rb-(x-y). 200= 80 + 70 + 50
200rb = z.4
z=200rb /4
z= 50 rb