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Thread: Puzzle - Sum of Digits

  1. #1
    Administrator
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    May 2006
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    331

    Puzzle - Sum of Digits

    Find sum of digits of D.

    A= 19991999
    B = sum of digits of A
    C = sum of digits of B
    D = sum of digits of C


  2. #2
    Junior Member
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    May 2006
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    10

    Re: Puzzle - Sum of Digits

    This is very interesting yet I think is very easy. You just to be careful in adding the digits.

    So the problem is:
    Find sum of digits of D.

    A= 19991999
    B = sum of digits of A
    C = sum of digits of B
    D = sum of digits of C
    A = 19991999
    B = 9 * 6 = 54 + 2 = 56
    C = 5 + 6 = 11
    D = 1 + 1 = 2


  3. #3
    Contributing Member
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    May 2006
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    82

    Re: Puzzle - Sum of Digits

    Instead of manually adding the digits is there any way of solving this problem. Suppose we have more digits in the number manually adding would be tiring. So if some other way for doing this problem is presented it would make this discussion even more interesting.


  4. #4
    Junior Member
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    Nov 2006
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    1

    Re: Puzzle - Sum of Digits

    Quote Originally Posted by admin View Post
    Find sum of digits of D.

    A= 19991999
    B = sum of digits of A
    C = sum of digits of B
    D = sum of digits of C
    The number 9 doens't place a value, any number added with 9 ll remains the same value in these type of cases.. so the value of D = 2.
    (eg): the sum of 9197 is 26 and the sum of 2 and 6 is 8. Now cancel the 9's and add the remaining 1 7 is also 8. In these type of expressions it is better to cancel the 9's


  5. #5
    Contributing Member
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    Sep 2006
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    962

    Re: Puzzle - Sum of Digits

    I have a doubt...Anybody have a formula for multiplying the 9's.

    My coleague give answer within a second, if i give number 9's multiplication...

    Example..if i ask what is the value of 9x9x9x9x9x9 + 9x9x9x9x9x9x9 , then he told the answer within a second...

    If any one have an idea about this?

    Last edited by psuresh1982; 12-22-2006 at 09:31 AM.

  6. #6
    Junior Member
    Join Date
    Oct 2008
    Answers
    9

    Re: Puzzle - Sum of Digits

    sum of digits of D = E


  7. #7
    Junior Member
    Join Date
    Aug 2009
    Answers
    3

    Re: Puzzle - Sum of Digits

    Hi suresh,
    Ans is 2


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