Logic Puzzles
This topic will be exclusively for logic puzzles!
Do you prefer riddles? (click here to go to the riddle topic)
Let's start with a logic puzzle! Which square fits in the last grid?
What comes next?
Which common word or phrase is depicted below?
You have two ropes coated in an oil to help them burn. Each rope will take exactly 1 hour to burn all the way through. However, the ropes do not burn at constant rates. There are spots where they burn a little faster and spots where they burn a little slower, but it always takes 1 hour to finish the job.
With a lighter to ignite the ropes, how can you measure exactly 45 minutes?
@DarkWolf I think I'd use the lighter to see the hands of my watch... 😂 Or if I were really serious, I could try to 'average' it by cutting the ropes into small pieces and only burning three quarters of those. But really, I can't imagine measuring 45 minutes with two non-divisible chunks of 60 min.
I also thought of mounting a spaceship, and going at 0.66 c, but then... I'd probably have a problem trying to know when the rope is ignited and when it goes out on earth - unless maybe if I only circle earth at that speed.... hmmm. Who knows what happens if I fold the ropes and light the halves / quarters together - might burn faster or slower... Probably faster, due to it all being warmer.
Or if the lighter fluid lasts long enough, I could keep that thing burning for 1h, and measure the amount of fluid that takes, and then keep it on until three-quarters of the same amount of fluid are gone again. But that wouldn't be exact, either. And it might start getting a bit warm on my fingers.
So, I'm curious to read your answer, DarkWolf :)
@cloudySummer
You didn't quite get the right answer yet.
Having said that, not only was that a great exercise in creative thinking and writing but it also put a smile on my face. I would call that a success.
Let's give other people some time to try and solve it first before I give the answer. A little hint is that you can light the rope from both ends at the same time.
@DarkWolf Hah, yes. Got it now. Thanks for the hint :)
How many differently sized circles appear below?
@DarkWolf Not sure about the subtleties of the English language here. I can see 13 single circles, of 5 different sizes. In my understanding, that would be 5 differently sized circles (some of which are printed multiple times). If there is a trick to this question, I probably haven't found it...
Serena and Venus decided to play tennis against each other. They bet one dollar on each game they played. Serena won three bets and Venus won five dollars.
How many games did they play?
@DarkWolf
Serena won 3 bets.
But Venus won 5$
Which means V had to beat S atleast 5 times. Then V had to beat S 3 more times to nullify the lead. And 3 more games where S took the lead.
So, in all 11 games.
Of which V won 8 and S won 3
@DarkWolf
Assuming their bets apply after a single game of 4 points is won (not set, or match), then $S = bets won by S - bets lost by S, $V = bets won by V - bets lost by V or $V = bets lost by S - bets won by S because bet lost by S = bet won by V. Question says S lost 3 bets, and V had $5, so I think:
$S = 3 - bets lost by S, $V = bets lost by S - 3 or 5 = bets lost by S - 3, bets lost by S = 8 and total games played = bets lost + won by one person which is 11
If they're betting after a tennis match is won, and there's 3 sets in a match, and 6 games in each set, they must've been playing a lot of tennis games
@kyan1
Typo correction: Question says S lost won 3 bets
@kyan1 @DonaldDraper @Barltik2065
11 is indeed the intended answer!
The phrasing was used to make clear Serena did win three times (getting 1 dollar each time) but in total still had to pay 5 dollars to Venus. With that interpretation 11 is the correct answer. If you have a different interpretation, I'd still be happy with the answer as long as your calculations are correct.👍
Which comes next in the sequence?
6, 13, 28, 59, ?
A. 111
B. 122
C. 126
D. 128
What common word or phrase can you find in the image below?
Which conclusion follows from the statements, with absolute certainty?
- None of the stamp collectors is an architect.
- All the drones are stamp collectors.
A. all stamp collectors are architects
B. architects are not drones
C. no stamp collectors are drones
D. some drones are architects
If you rearrange the letters of "ahret," you would have the name of a:
a. Ventricle
b. Fish
c. River
d. Planet
e. Country
@DarkWolf Actually, a (human) heart has two ventricles (and two atria), unless maybe an insect's or a worm's, that only has one, as far as I know. So while I think it's supposed to be a)... that would still be incorrect.
Fun fact: there does exist a virtual planet Thera, as some add on to a video game 😏 (and there are so many rivers in all possible languages, there may be one that consists of those letters).
@cloudySummer
This is one of those questions where some get lucky and instantly see it, while others just won't get to the answer at all.
The intended and most obvious answer to this one is 'planet' earth 😇
@DarkWolf Ha, oh man, that's embarrassing, lol 😄😂