Tag Info

Born on the same day, but one is two years older

We'll just apply a bit of science assuming they were born in same year as well:
• 959
Accepted

Measure 22 minutes with 7 and 13 minute hourglasses

A very simple solution, taking is to A better solution takes only How?
• 27k
Accepted

A clock correct three times a day

Since a stopped clock already agrees with a correctly running clock twice per day, So the answer (that requires the smallest clock hand speed) is Since the answer must be symmetrical (as long as the ...
• 69.3k

Accepted

It is
• 4,324
Accepted

Born on the same day, but one is two years older

They were born on
• 69.3k

Born on the same day, but one is two years older

Apply some other bit of science, assuming they were born at the same time,
• 561

Older twin's birthday is one day after younger's

Foo is older than Bar, but celebrates his birthday the day after Bar because one of the following happened:
• 15k

Born on the same day, but one is two years older

Is it lateral-thinking?
• 3,070

My birthday is uncommon

Similar to Daniel's answer but a slight variation:
• 421

A clock correct three times a day

Suppose we have an accurate clock and the fast clock, and that they start off showing the same time. Here is an alternative method:
Accepted

Aging A Lot Faster

The day is Reasoning: Classic Mind Puzzle :) My fav <3
• 7,482
Accepted

A man is born in 1955

The answer is simply: I have heard this one before but I don't remember where, maybe the movie you mentioned.
• 941
Accepted

How often does a digital watch show a palindrome?

Let us denote the time by AB:CD:EF, where AB is between 00 and 23, CD and EF are each between 00 and 59, and of course A=F, B=E, C=D. The middle two digits Since ...
• 114k
Accepted

All clock hands at equal degrees from each other

At noon, all three hands are at $0$ degrees from each other. Let's say the Moment of Truth is after the hour hand has moved around $x$ degrees. In that time, the minute hand moves $12x$ degrees and ...
• 114k

Measure 22 minutes with 7 and 13 minute hourglasses

22 minutes with lateral thinking (though the accepted answer is better)
• 943

• 241

Older twin's birthday is one day after younger's

Because they are... And they were born... And...
• 1,378

A clock correct three times a day

Alternative method: The answer to how fast the clock must go:
• 331
Accepted

Full-sized ice cubes

First produce 48 by putting the traces up/down/up/down/up in the freezer. Then use 18 of the ice cubes and put them in the corners of the botton 6 trays, produce 66 more ice cubes. Do this 2 more ...
• 6,874
Accepted

Explain this holiday calendar oddity

Would it be because:
• 396
Accepted

Digital Clock Brightness

Logic behind the answer: So, without really looking at anything else, my initial guess is: resulting in: Note: Edit:
• 2,366
Accepted

When was I born?

You and your twin were born:
• 35.4k
Accepted

Two brothers, two watches

It is currently and the older brother is How I figured this out:
• 24.1k
Accepted

Using burning ropes as timer - how to measure 1 hour and 8 minutes with 3 ropes?

Ok I will present a solution. For convenience, I will number the ropes in the order of their burning. STEP ONE STEP TWO STEP THREE FINAL STEP I have successfully measured 1hour 8 minutes or 68 ...
• 354
Accepted

Probability of three identical digits on a four-digit digital clock?

Number of qualifying times: Probability:
• 10.2k
Accepted

Finally, you wake up from a coma

The date of the accident is Explanation
• 4,821
Accepted

Riddle Man's age

The only perfect square in the 19th century is: Which would make him For the 20th century:
• 4,599
Accepted

A mosquito is born at T=0 and after 2 seconds makes a new mosquito every second, how many mosquitos at T=8.5?

There are Because
• 9,301
The clockface is divided into $60$ segments.