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X is a 2-digit positive integer, what is the tens' digit of

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X is a 2-digit positive integer, what is the tens' digit of [#permalink] New post 06 May 2006, 04:27
X is a 2-digit positive integer, what is the tens' digit of 2x?

1) The units' digit of 2x is 6
2) The units' digit of x is 3
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 [#permalink] New post 12 May 2006, 03:59
Agree with E:
x=10*a+b => 2x=20*a+2b
From 1) 2b=6 => b=3;
From 2) b=3
so 1) equal 2) and give no info about ten's digit
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 [#permalink] New post 12 May 2006, 04:01
Ohhh wrote a stupit thing about 2b....but still no info about ten's digit
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 [#permalink] New post 12 May 2006, 04:04
Agree with E.
Both give only units digit info.
  [#permalink] 12 May 2006, 04:04
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