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What is the tens digit of the sum of the forty numbers such

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Senior Manager
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Joined: 10 Dec 2004
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What is the tens digit of the sum of the forty numbers such [#permalink] New post 13 Jan 2005, 14:50
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What is the tens digit of the sum of the forty numbers such that 1, 11, 111, 1111, ...?
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"Forums are meant to benefit all. No one is interested in knowing what your guesses are. Please explain the reasoning behind the answer you chose. This will also help you organize your thoughts quickly during the exam."

Director
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Joined: 07 Jun 2004
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 [#permalink] New post 13 Jan 2005, 16:02
Units add up to 40
while tens will add up to 39 as the first digit hasno tens it will be

4+ 39 = 43

answer 3
VP
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 [#permalink] New post 13 Jan 2005, 17:02
3 same logic as above.
  [#permalink] 13 Jan 2005, 17:02
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What is the tens digit of the sum of the forty numbers such

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