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Tricky Nine Maths Riddle

Tricky Nine Maths Riddle - 18 January

A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?

For Solution : Click Here

26 comments:

  1. Mark has to paint the number nine , 20 times.

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  2. zero time because there is no 9th floor in a buliding

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  3. 20 times....
    10 times in the 10s place (the 90's)
    10 times in the 1s place (09,19,29...)

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    Replies
    1. what about 99 it only occurs once ...

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    2. there are two 9's in 99. therefore he painted two 9's

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  4. its 21 guys because he has to paint 1 two times in "11"...
    :P

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  5. 20 tyms......
    (9,19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99)

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  6. This comment has been removed by the author.

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  7. This comment has been removed by the author.

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  8. mark had to paint 11 nines.....09,19,29,39,49,59,69,79,89,99..hence proved..

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    Replies
    1. forgot the numbers 90 91 92 93 94 95 96 97 and 98

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  9. 20 (9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99)

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  10. 40. every time he painted a 6, he also pained a 9 just upside down.

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