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 Microwave Math (Posted on 2005-11-08)
The keypad on my friend's microwave is broken: only one of the number keys (the N key) works. He found a workaround that allows him to cook for exactly 2 minutes, which is perfect for rewarming his giant cup of coffee. He does this by entering NN seconds, then start. He cooks for a period of time and then hits the pause button followed by N and start. (On his microwave, entering 99 would be the same as entering 139, since the 3rd number from the right is minutes)

For example, if N were "1", he could enter 11, cook until the display reads 6, pause, enter 1 (the display then reads 61), and cook for a total of 66 seconds. He also brags that using the same N key as above, but by pausing at a different time, he can cook for another whole number of minutes (other than 2).

Which number key is working on his microwave?

 See The Solution Submitted by Larry Rating: 3.5000 (2 votes)

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 re: And the winning number is... | Comment 6 of 8 |
(In reply to And the winning number is... by Bob Smith)

Other times available with only the 7 key working, and using a single or double press initially, and then a single press are given in the following table. The columns are the initial entry, the timed interval, the delay before pausing and the reading at the pause.

` 7  0:14     7  0 7  0:23     6  1 7  0:32     5  2 7  0:41     4  3 7  0:50     3  4 7  0:59     2  5 7  1: 8     1  677  1:24    77  077  1:33    76  177  1:42    75  277  1:51    74  377  2: 0    73  477  2: 9    72  577  2:14    67 1077  2:18    71  677  2:23    66 1177  2:27    70  777  2:32    65 1277  2:36    69  877  2:41    64 1377  2:45    68  977  2:50    63 1477  2:59    62 1577  3: 4    57 2077  3: 8    61 1677  3:13    56 2177  3:17    60 1777  3:22    55 2277  3:26    59 1877  3:31    54 2377  3:35    58 1977  3:40    53 2477  3:49    52 2577  3:54    47 3077  3:58    51 2677  4: 3    46 3177  4: 7    50 2777  4:12    45 3277  4:16    49 2877  4:21    44 3377  4:25    48 2977  4:30    43 3477  4:39    42 3577  4:44    37 4077  4:48    41 3677  4:53    36 4177  4:57    40 3777  5: 2    35 4277  5: 6    39 3877  5:11    34 4377  5:15    38 3977  5:20    33 4477  5:29    32 4577  5:34    27 5077  5:38    31 4677  5:43    26 5177  5:47    30 4777  5:52    25 5277  5:56    29 4877  6: 1    24 5377  6: 5    28 4977  6:10    23 5477  6:19    22 5577  6:24    17 6077  6:28    21 5677  6:33    16 6177  6:37    20 5777  6:42    15 6277  6:46    19 5877  6:51    14 6377  6:55    18 5977  7: 0    13 6477  7: 9    12 6577  7:14     7 7077  7:18    11 6677  7:23     6 7177  7:27    10 6777  7:32     5 7277  7:36     9 6877  7:41     4 7377  7:45     8 6977  7:50     3 7477  7:59     2 7577  8: 8     1 76`

 Posted by Charlie on 2005-11-08 11:29:30

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