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

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Senior Manager
Joined: 08 Aug 2005
Posts: 251

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X is a 2-digit positive integer, what is the tens' digit of [#permalink]

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06 May 2006, 04:27
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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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Intern
Joined: 23 Feb 2006
Posts: 39

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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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Intern
Joined: 23 Feb 2006
Posts: 39

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12 May 2006, 04:01
Ohhh wrote a stupit thing about 2b....but still no info about ten's digit

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Director
Joined: 24 Oct 2005
Posts: 658

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Location: London

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12 May 2006, 04:04
Agree with E.
Both give only units digit info.

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12 May 2006, 04:04
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X is a 2-digit positive integer, what is the tens' digit of

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