Questions tagged [logical-deduction]

A puzzle that requires formal logical deduction to arrive at the solution. This suggests more than merely reasoning through clues to find an answer (you might want [situation] for that).

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1answer
731 views

Find the Different Sugar Cubes [duplicate]

There are 10 Boxes, each contains 1000 sugar cubes. The sugar cubes in 9 of the boxes are 10 grams each and the other box has 9 gram cubes. There is a digital scale that you can use it ONCE. (i.e. ...
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1answer
3k views

What is number of car parking spot ? [duplicate]

. What is the number of this car parking spot?
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2answers
254 views

Colored stones on a chess board puzzle [closed]

We have a chess board of size n x n and there is exactly one stone on every square. We have green, blue and red stones. We must not have a row or a column full of stones of the same colour. We can ...
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2answers
155 views

Bowser and Mario in a Pinch! [duplicate]

Our little hero starts off in a round (or square) pit with very high walls, an escape does not seem possible. However also in the pit is Bowser! How did that happen? Both of them are now facing off ...
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3answers
617 views

Who is the fifth child?

Jason's mother has five children. The first one is July. The second one is August. The third one is September. The fourth one is October. What is the fifth child's name?
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6answers
639 views

Somebody ordered a pizza

Somebody ordered a pizza. They ordered $X$ slices with pepperoni, $Y$ slices with mushrooms, and $Z$ slices with cheese. If no two slices were identical, and no combinations of toppings were not ...
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2answers
433 views

When will the bacteria fill the test kit? [closed]

A test kit, is a gathering place for a colony of bacteria. This Colony, at 12 pm cell division has created a bacteria. Every minute, every bacteria is divided into two bacteria. 12: 43 (43 minutes ...
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3answers
485 views

The 3 Boxes Show! [duplicate]

A variation of the Monty Hall, where the values inside the choices are changed You were just out gambling and lost 5000 dollars! Of course being the gambler that you are, you pay 2500 to play this ...
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votes
2answers
253 views

Amazing sudoku who can find hot numbers

Sudoku X Place the numbers 1-6 once in every row, column, diagonal, and 3x2 block. The diagonals form an X and are highlighted. Puzzle Text of puzzle ----------------- | . . . | 5 . . | | . . . | ...
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1answer
716 views

Solve this Encoded Text!

I wonder if you'll be able to reverse this set of words, but first you may want to get a bit shifty! iLppk scyc, wys ihmgltvihi xm! vKein xfs :H I have given you all the information you need to ...
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2answers
857 views

Brain Testing Logical Reasoning Puzzle

Can you answer this logical puzzle? Puzzle Source: https://www.funwithpuzzles.com/2018/12/brain-testing-logical-reasoning-puzzle.html
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2answers
788 views

Find the right cup

A blind man went to a sorcerer to regain his sight. The sorcerer placed eight different colored cups in front of him, and said that one of these cups contained a magic drink while the other seven ...
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2answers
620 views

3 guards, 3 objects, 3 monsters and 3 questions

You are standing before 3 objects. You need to give the right one to the right monster or else you'll die. There are 3 people in front of you for you to question. One always lies, one always tells ...
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1answer
172 views

How many ways could Alice have filled out the answer sheet? [closed]

Alice, Brie, Carlos, and Drake are taking a true/false quiz at school. There are four questions. The teacher was sneaky and made the answer to every question "true." Each person got a different score, ...
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2answers
140 views

How do you Solve an Age-Old Problem? [closed]

Mansion has a son (Mark) and a daughter (Mindy). Mark is older than Mindy. Five years ago, Sum of Mark and Mindy’s ages was twenty two. Five years from now, Mark will be exactly twice as old as Mindy....
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1answer
227 views

5 ferries, their capacities and ticket price

Five ferries - King's Way, Speedster, Sea Monster, Astar and Blue Surfer operate to Manuchan Island. The capacities of these ferries are 25, 30, 40, 50 and 60, not necessarily in the same order. Each ...
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9answers
622 views

5 guards, 5 doors, and probability

1st Guard: Always lies all the time. 2nd Guard: Always tells the truth all the time. 3rd Guard: 75% probability of telling the truth. 4th Guard: 50% probability of telling the truth. 5th Guard: 25%...
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2answers
1k views

Logic-grid puzzle. How do I have to interpret the clue?

There are eight students named Aman, Bobby, Chameli, Deepak, Ekta, Farook, Garima and Harsh in a school. They are in class 6th, 7th and 8th with no more than three students in any class. Each of ...
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5answers
420 views

Who killed the frog🐸? [closed]

There was one frog, mistakenly fallen into a pan full of boiling water. No animals were harmed in the making of this question Biologically, frog has tendency to change the temperature of his/her ...
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votes
1answer
216 views

Who is the man in the picture

Alex is looking at a picture of a man and states, "Brothers and sisters have I none, but that man's father is my father's son." Who is the man in the picture?
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3answers
256 views

What am I looking for?

What am I looking for? 31EC7E509B5ED4 DE71545E9924CB 2B6A7E9E38FAD8 B316BA4B59F007 To solve this Puzzle without hints in my opinion is quite hard! But it's not impossible, just tricky. Be aware a ...
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votes
1answer
274 views

Camels, Sheep, Lambs and Cows [closed]

Find the value of the camel. Easy enough right? this is not my puzzle
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1answer
145 views

Put 4 boxes in a box - How to [closed]

John has divided a box in two. John wants to put two boxes in each part of the box. Can he do it? If so, how?
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1answer
555 views

Whale Length Puzzle [closed]

A whale has 15 meters of length. Her head is as big as her tail. If her head was two times longer than it actually is, her head and her tail, together, would be as long as the rest of her body (i.e., ...
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2answers
460 views

Guess the missing alphabet!

What is the missing alphabet in below sequence? M T W T _ _ S
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1answer
1k views

Working schedule (with explanation) [closed]

Alice, Bob, Chris, Dave, Eric, Fred and Laura used to work in a restaurant 6 days a week, from Tuesday to Sunday (Monday is a day off). Every one works at least for one day, and at least two people ...
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votes
1answer
923 views

we are five we have three thousand four hundred fifty who are we? [closed]

we are five we three thousand four hundred fifty, who are we ?. Its a riddle like question but stranded with getting the answer for this question , am very sure the answer will make me slap my head ...
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votes
1answer
171 views

Find your way out of the temple [duplicate]

You and 8 other students are trapped inside a temple and the temple will collapse in an hour.There are four ways, out of which only way one leads out and the other three have dead ends. Also one of ...
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2answers
1k views

Make the statement true!

You need to add a single line and make the statement true $5+5=5$ All the numbers are made by matchsticks.
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votes
2answers
234 views

Are rotton apples edible? [closed]

Choose the conclusion that validly follows from the argument below. Some apples are edible. All edible food are not rotten. Therefore A. All apples are not rotten. B. Some apples are rotten. C. ...
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votes
1answer
334 views

Apples and Oranges

You were on a grocery shopping day, you go to the store, and your friend tells you he'd like you to pick him up some fruit, naturally you try and be a kind friend and agrees to pick it up for him, you ...
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2answers
4k views

The 2 Doors, One leads to the truth other leads to certain death [duplicate]

You approach two talking doors. One door leads to the City of Truth, while the other door leads to the City of Liars. You do not know which door is which. You are able to ask only one question to ...
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votes
1answer
609 views

Circular arrangement Puzzle

I was given this puzzle: Eight friends (Romil, Ramesh, Rakesh, Rohit, Rahul, Abhijeet, Abhishek and Anil) are sitting around a circular table, but not necessarily in the same order. Four of them ...
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votes
1answer
515 views

3 suspects Logic Puzzle [duplicate]

The following puzzle was posted here, but providing answers to the puzzle was closed without a correct and complete answer being provided: An inspector knows that exactly one of 3 suspects committed ...
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votes
3answers
249 views

Only one option is correct [closed]

$a \in \mathbb{C}$ Which is the correct option: 1) $a = 1$ 2) $a = 42$ 3) $a = i =\sqrt{-1}$ 4) $0^a \in \mathbb{C}$ 5) $a^3 = 1$ Hint 1: Hint 2:
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6answers
9k views

Fit ten horses in nine boxes [closed]

Here is my puzzle: How can you fit ten horses in nine boxes? Here are the boxes: Rules: All boxes must be filled No additional boxes can be created Good luck :)
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4answers
2k views

Turning a dog (Part 2) [closed]

Here is Mr. Dog, friend of Mrs. Goat. Move only two matchsticks such that Mr. Dog's head faces the opposite direction, i.e. to the right side. This is Part 2 of turning the animal series. See Part 1 ...
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7answers
390 views

Crossing the Bridge together [closed]

Two friends each weighing 150 lbs arrive at a Rope bridge 100 yards long. The warning sign at the start of the bridge informs it can hold only a maximum of 325 lbs of weight at any given second, ...
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votes
2answers
190 views

Come on people! what am I? [closed]

You are in a store when out of nowhere you hear a voice. It asks. what am I? It follows the question with a story. I asked a lady before and she said “I think you are a banana?” then I ...
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3answers
247 views

Riddle Again, Riddle Again, What am I? [closed]

1. If a chicken says, "All chickens are liars" is the chicken telling the truth? 2. A man is traveling to a town and comes to a fork in the road. If he goes left, he goes to the liars' village....
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votes
3answers
590 views

Number puzzle: 4 is to 1, as 12 is to 2, as 86 is to ___? [closed]

I came across this puzzle and can't figure it out. 4 is to 1, as 12 is to 2, as 86 is to ___? I wish I could clarify the question but this was the way it was presented without further clues or ...
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votes
1answer
227 views

Write an equation using constants e, i, pi and phi [closed]

Without using numbers and using only permitted math operators, write an equation using the constants $e$, $i$, $\pi$ and $\phi$. Allowed operators..exponent...multiplication..subtraction...only. Use ...
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2answers
215 views

What is wrong with this Sudoku Game?

Before you, you have a game. There's something wrong with this game. Can you figure out what it is? ...
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2answers
257 views

“Infinite Steps” [closed]

Three Mathematicians standing on infinite ladder on step number 35, 192, 227 respectively. Everyone has same two secret formula, based on current standing position(step Number) one of the formula ...
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3answers
468 views

Lazy Larry and the Poll Homework

One sunny Friday, one of the stricter teachers of Lazy Larry's class decided to give her students a surprisingly mundane poll homework. Every student was required to talk to 100 people, dividing them ...
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votes
1answer
3k views

How can the man get across the river with the two animals and the cabbage? [duplicate]

A man has a wolf, a goat, and a cabbage. He must cross a river with the two animals and the cabbage. There is a small rowing boat, in which he can take only one thing with him at a time. If, however, ...
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votes
3answers
14k views

Crossroad with an Indian from one of two tribes [duplicate]

You are on a trail in a desert. You already drank all your water, and are 2 miles from the next well. There is a crossroads in the trail. One path leads directly to the fountain, and one leads out ...
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2answers
126 views

Be Quick and Calculating..Take Four Shots

To Target Sum of 100 Exactly . By shooting the right different numbers in four shots summing upto 100.
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votes
1answer
268 views

Which screws go first?

Humans are not always accurate at measurements. I recently got a table top that came with an attachment. Table top and attachment are nearly of same size and rectangular with four screw holes near ...
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5answers
5k views

The Most Intelligent Prince

A king wants his daughter to marry the smartest of 3 extremely intelligent young princes, and so the king's wise men devised an intelligence test. The princes are gathered into a room and seated, ...