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

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What is the tens digit of the sum of the forty numbers such [#permalink] New post 13 Jan 2005, 15:50
What is the tens digit of the sum of the forty numbers such that 1, 11, 111, 1111, ...?
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 [#permalink] New post 13 Jan 2005, 17:02
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
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 [#permalink] New post 13 Jan 2005, 18:02
3 same logic as above.
  [#permalink] 13 Jan 2005, 18:02
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