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Microwave Math (Posted on 2005-11-08) Difficulty: 2 of 5
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)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution And the winning number is... | Comment 1 of 8

7

Key in 77, let run down to 4 for 73 seconds, hit 7 again for the remaining 47 seconds.

I sense some "five fives" potential here...what other times are achievable?


  Posted by Bob Smith on 2005-11-08 09:58:07
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