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

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Senior Manager
Joined: 10 Dec 2004
Posts: 274
Followers: 1

Kudos [?]: 59 [0], given: 0

What is the tens digit of the sum of the forty numbers such [#permalink]  13 Jan 2005, 14:50
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
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 289 [0], given: 22

while tens will add up to 39 as the first digit hasno tens it will be

4+ 39 = 43

VP
Joined: 18 Nov 2004
Posts: 1442
Followers: 2

Kudos [?]: 20 [0], given: 0

3 same logic as above.
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