Brain Teasers
What's the Time?
At a certain time I looked at a 24-hour digital clock and noticed some things about the time:
1) The number in the hours section plus the number in the minutes section makes 60.
2) One of the digits in the minutes section is the square root of the other digit in the minutes section.
3) The sum of the digits in the minutes section is the number in the hours section reversed. What was the time?
1) The number in the hours section plus the number in the minutes section makes 60.
2) One of the digits in the minutes section is the square root of the other digit in the minutes section.
3) The sum of the digits in the minutes section is the number in the hours section reversed. What was the time?
Answer
From clue 2 we know the time has to be : ??:00, ??:11, ??:24, ??:42 or ??:39.For clue 1 to work the times would have to be : 60:00, 49:11, 36:24, 18:42 or 21:39. Of these only 18:42 and 21:39 could show up on a 24 hour clock.
4+2 does not equal 81 so 18:42 doesn't work for clue 3. 3+9 does equal twelve, so the time was 21:39.
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Comments
That's a pretty good riddle, really pretty good!! Top!
good one it was hard
Now that took a while, but it ended up a great teaser!
Thanks for the compliments!
that was good!
Very easy.
Since the maximum value in the hours is 24, the minimum value in the minutes is 60-24=36. This leaves only 39 and 42 where one digit is the square of the other
3+9=12 and 60-39=21
Since I checked this first I was done, but 4+2=6 only yeilds a single digit result, so there is no reverse. If you allow a digit to be it's own reverse, 6+42=48, not 60.
Having only two choices made this overly simple. A couple of seconds to solve--not enough to justify the time to read it.
Since the maximum value in the hours is 24, the minimum value in the minutes is 60-24=36. This leaves only 39 and 42 where one digit is the square of the other
3+9=12 and 60-39=21
Since I checked this first I was done, but 4+2=6 only yeilds a single digit result, so there is no reverse. If you allow a digit to be it's own reverse, 6+42=48, not 60.
Having only two choices made this overly simple. A couple of seconds to solve--not enough to justify the time to read it.
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