<PRE><B>Question 507904</B>
Call the digits a,b, and c
The number is abc
given:
a = c + 2 
abc - cba
The units digit will be c - (c + 2) ,
but to do this, you have to carry
10 over to the c, and you have
10 + c - (c + 2) = 8
check:
abc = 553
cba = 355
553 - 355 = 198
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abc = 917
cba = 719
917 - 719 = 198
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abc = 391
cba = 193
391 - 193 = 198
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The result is always 198</PRE>