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x = ratusan
y = puluhan
z = satuan
xyz = 100x + 10y + z
pqr
p =ratusan
q = puluhan
z = satuan
pqr = 100p + 10q + r
z + r = 10
kenapa? karena bilangan akhir dari 1000 adalah 0, dan tidak mungkin salah satu dari z dan r bernilai negatif.
1000 - 10 = 990
puluhan = 90
ratusan = 900
10y + 10q = 90
y + q = 9
100x + 100p = 900
x + p = 9
z + r + y + q + x + p = 10 + 9 + 9 = 28