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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?

1. 20 times.

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

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

4. 20 times....
10 times in the 10s place (the 90's)
10 times in the 1s place (09,19,29...)

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

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

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

6. 20 tyms......
(9,19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99)

7. 19 times

1. sorry,20 times

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

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

11. 20 (9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99)

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