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1800/2 x 7 = 6300 uang citra 6.300-1.800 = 4.500
Ahmad = x
Beni = y
Citra = z
x = 2/3y
y = 2/7z
x = 12.000
Masukkan x,
x = 2/3y
12.000 = 2/3y
y = 12.000 : 2/3
y = 12.000 x 3/2
y = 18.000
Masukkan y,
y = 2/7z
18.000 = 2/7z
z = 18.000 : 2/7
z = 18.000 x 7/2
z = 63.000
Sehingga,
z - y = 63.000 - 18.000 =
Jadi, selisih uang Beni dan Citra adalah Rp 45.000