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Building Puzzle

Building Puzzle - 16 November

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

For Solution : Click Here

27 comments:

  1. from 1 to 99 consider all numbers as two digit numbers
    00
    01
    02
    .
    .
    .
    99

    so total no.of digits=2*100=200
    each digit (0,1,....9) appears equal no.of times so 9 appears=200/10=20 times from 1 to 100

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  2. 20, 09-89 = 9, 90-99 = 11

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  3. There are another 20 "9"s upside down!!!!!!

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  4. 20 bcz 9,19,29,39,49,59,69,79,89,90,91 92 93 94 95 96 97 98 99.hre there r 20 9's present hence the answer is 20

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    Replies
    1. that amounts to 19 dumb ass

      Delete
    2. You have to count 99 twice dumb ass.

      Delete
  5. This comment has been removed by the author.

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  6. 1. 09
    2. 19
    3. 29
    4. 39
    5. 49
    6. 59
    7. 69
    8. 79
    9. 89
    10. 90
    11+12. 99
    the 9. 89 would technically 13

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  7. 20 9s are used for 1 - 100 street numbers

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  8. 40.
    There are 20 9's and 20 6's which is nothing but '9' reversed.

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  9. This comment has been removed by the author.

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