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XYZ = 100X + 10Y + Z
Karena nilai 1000, maka R + Z = 10
Dan karena sisa nilai tinggal 990, maka
10Q + 1OY = 90
Q + Y = 9
Sisa nilai tinggal 900, maka
100P + 100X = 900
P + X = 9
P + Q + R + X + Y + Z = 28
didapat
147 + 853 = 1000
maka nilai P + Q + R + X + Y + Z
= 1 + 4 + 7 + 8 + 5 + 3 = 28