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uang ibu = b
a/b = 2,25 >>>> a = 2,25b
a-b = 280000
2,25b - b = 280000
1,25b = 280000
b = 224000
a= 2,25b
a = 2,25(224000)
a = 504000
jadi uang ayah (a) = Rp. 504.000,- dan uang ibu (b) = 224.000 .