# 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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### 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. ...
3k views

### What is number of car parking spot ? [duplicate]

. What is the number of this car parking spot?
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 ...
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 ...
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?
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 ...
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 ...
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 ...
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 . . | | . . . | ...
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 ...
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
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 ...
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 ...
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, ...
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....
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 ...
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%...
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 ...
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 ...
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?
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 ...
274 views

### Camels, Sheep, Lambs and Cows [closed]

Find the value of the camel. Easy enough right? this is not my puzzle
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?
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., ...
460 views

### Guess the missing alphabet!

What is the missing alphabet in below sequence? M T W T _ _ S
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 ...
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 ...
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 ...
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.
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. ...
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 ...
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 ...
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 ...
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 ...
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:
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 :)
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 ...
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, ...
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 ...
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....
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 ...
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 ...
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? ...
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 ...
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 ...
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, ...
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 ...
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.