ANSWERS: 11
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Once?
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20 times... 10 9's and 10 upside down 9's , 6's this is called modern math.
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9, 19, 29, 39, 49. 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99. 20 times in all.
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19 times, all numbers ending in 9 from 9 to 89 and all numbers from 90 to 99.
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Hmmm... If you include the 6's you get when you flip the mask over, it's a bit more than 20: 6,9,16,19,26,29,36,39,46,49,56,59,66,69,76,79,86,89,90, 91,92,93,94,95,96,97,98,99. I get 32.
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if Mark was smart, he'd just get adhesive stencils and not paint a single damn one
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20
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19 times on each door time 100 doors so 1900 times total
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20?
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twenty
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1) I like the idea to include the 6s (9 upside down, for some). But if you say this, you could also say that you won't paint a 9 a single time, as those alleged 9s are upside down 6s, actually... In practice, he could reuse the stencil he has for the 6. Further information: http://en.wikipedia.org/wiki/Stencil 2) There is one 9 as the unit number in every number of the 10 decades: 9, 19, ... ,99 There is one other 9 as the decade number for every one of the 10 number of the last decade: 90, 91, ..., 99 So we get 10 + 10 = 20 3) For the same reason, there are exactly as many of any other digit with two exceptions: - there are 11 times 0: you get 1 less because you start by 1, 2 more because you end at 100, and 10 less because it is not drawn in the first decade. - there are 21 times 1 (one more), because you end at 100. (except 0, of which there are only 9, when you start by 1, and end).
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