Consider this…
A new building has just been built containing 100 different rooms. A painter was hired to paint the numbers 1 to 100 on the doors. If each door is numbered once with a number counting from 1 to 100, how many times will the painter have to paint the number 9?
Give me the total times 9 is painted and (if your really nice) list them for me.
2006-06-20 11:13:40 · 20 answers · asked by Answers Anyone 4 in Entertainment & Music ➔ Jokes & Riddles
He wrote it 99 times, i hope!LOL
2006-06-20 11:15:13 · answer #1 · answered by Pretty "N" Simple 3 · 0⤊ 0⤋
Everyone seems to have forgotten the rooms 90, 91, 92, etc.
Here's a breakdown for each digit, how many times it will be painted and what rooms have those digits:
0: 11 times = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
1: 21 times = 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 31, 41, 51, 61, 71, 81, 91, 100
2: 20 times = 2, 12, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 42, 52, 62, 72, 82, 92
3: 20 times = 3, 13, 23, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 43, 53, 63, 73, 83, 93
4: 20 times = 4, 14, 24, 34, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 54, 64, 74, 84, 94
5: 20 times = 5, 15, 25, 35, 45, 50, 51, 52, 53, 54, 55, 56, 57, 48, 59, 65, 75, 85, 95
6: 20 times = 6, 16, 26, 36, 46, 56, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 76, 86, 96
7: 20 times = 7, 17, 27, 37, 47, 57, 67, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 87, 97
8: 20 times = 8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98
9: 20 times = 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99
There are 19 rooms that have '9's on them, but room 99 has it twice. As you can see, the number 9 will be painted *20* times.
An easy way to think of it, is it will appear 10 times as a tens digit, and 10 times as a unit digit. That's a total of 20 times.
2006-06-20 11:20:19 · answer #2 · answered by Puzzling 7 · 0⤊ 0⤋
Well there's 20 9s in the building if you count all the 9s on the doors (9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99=20 9s) but it can be also once cause there is only one door in the whole building that has just a 9 in it and thats door number 9.
2006-06-20 11:20:32 · answer #3 · answered by Mary 3 · 0⤊ 0⤋
9, 19, 29, 39, 49, 59, 69, 79, 89, 99
He will paint the number 9 10-times, and 11 if you want t count the 6 as an upside-down 9.
2006-06-20 11:19:13 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Hotel Door Numbers
2016-11-04 07:54:21 · answer #5 · answered by ? 4 · 0⤊ 0⤋
9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99...
so 19 times if you're counting numbers, 20 if you're counting individual nines.
2006-06-20 11:18:47 · answer #6 · answered by sirius556 1 · 0⤊ 0⤋
9
19
29
39
49
59
69
79
89
90
91
92
93
94
95
96
97
98
99
... so that equals 20! :)
Or... 2,000 if he painted the numbers 1-100 on every door! :)
Or... if I really wanted to be a smartass he only wrote the number 9 once... or a hundred times if he did the 1-100 thing on every door! :)
2006-06-20 11:16:25 · answer #7 · answered by Anonymous · 0⤊ 0⤋
21 times total?
9
19
29
39
49
59
69
79
89
90-99
2006-06-20 20:58:04 · answer #8 · answered by calicandy27 2 · 0⤊ 0⤋
20 of them 9-19-29-39-49-59-69-79-89-90-91-92-93-94-95-96-97-98-99
2006-06-20 12:16:58 · answer #9 · answered by Chantae 2 · 0⤊ 0⤋
9,19,29,39,49,59,69,79,89,99
So he painted the number 9 11 times considering since 99 has 9 twice in it.
2006-06-20 11:17:46 · answer #10 · answered by Brittney L 2 · 0⤊ 1⤋
9
19
29
39
49
59
69
79
89
90
91
92
93
94
95
96
97
98
99
so that is 20 times in 19 rooms
2006-06-20 12:46:12 · answer #11 · answered by Anonymous · 0⤊ 0⤋