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misal total tabungan adalah x ..( 15 bagian)
A+C=70.000 ... 3/15 x + 7/15x =70.000 ....
B+C=84.000......5/15X + 7/15X=84.000 ....12/15 X =84.000...X= 105
jadi total uang mereka = 105.000