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
94 views

Express 50 to 100 with constituent digits only…my 100th pzl on 50th day

Using the following rules only, Express the numbers from 50 to 100 using only digits in the number. Concise with minimum number of characters is preferred. No concatenation of numbers allowed. Only, ...
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1answer
151 views

Dollars to Kids

Daam has 8 children, named Esha, Hansika, Deepa, Rinsu, Ira, Vimky, Abhiteet and Aankhal. She has 36 dollars with her. One day, she gifted the dollars among her children such that the eldest child got ...
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3answers
267 views

What is the name of the sixth son? [closed]

Alice's father has six sons. The first is named Aegon I. The second is named Aegon II. The third, fourth and fifth are named Aegon III, Aegon IV, Aegon V respectively. What is the name of the ...
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1answer
215 views

Office floor assignment

A real estate developer has built a new office building of six floors, and numbered the floors 1 through 6 from bottom to top. Each of the six companies — F, G, I, J, K, and M — must be assigned an ...
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3answers
294 views

Scrap puzzle to count how many

There are 250 scraps. For each 11 removed, one extra can be obtained. How much maximum is possible, if one cut by one unit? I have read this somewhere, and one guy gave the answer as 25, but I can't ...
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1answer
110 views

Fibonacci again..Distinct Digits..Detail all your Deductive Steps [closed]

$ABB$ $CDE$ $GFB$ $DPGB$ $QPFR$ $RDFD$
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1answer
248 views

Two ropes and 45 mins [duplicate]

You have got two ropes of same mass, same material, same thickness and same length but mass is not uniformly distributed over the length. Both of the ropes burn in 1 hour but you cannot cut them in ...
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1answer
177 views

Let's look at this simple logical query [duplicate]

.: Aziz is talking with Rashid: " If I pass the exam on Friday , I will spend the weekend in the mountain. I will also bring my sister Nigora with me, If she feels ok". On Sunday morning Rashid meets ...
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1answer
235 views

General Reasoning Puzzle About a Tank.? [duplicate]

A tank has been filled with water. On each minute advance the tank will fill double than previous. ie after completing one minute the tank will fill double the water as that in previous.So the tank ...
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1answer
114 views

The Guys - Logic #2 : Ways to work

So the guys are back. This time, they decide to change up their way to work. Let's see what they're up to... Start the two minute timer... 1. Since Anthony and Charles weren't taking the bus today, ...
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3answers
751 views

Awesome Murder Mystery [closed]

Source: gpuzzles.com Note: The owner of gpuzzles.com did not allow me to copy the puzzle, However site is fine pasting picture.
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1answer
309 views

What are the missing items of this number sequence? [closed]

1, 2, 5, 13, ?, ?, 1 Please give explanation.
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1answer
179 views

Humphrey meets Laureen in town

Laureen is talking with Humphrey: "if the weather is good on Sunday I will go to the horse races. I will also bring my friend Sam with me, if he feels ok". on Sunday afternoon Humphrey meets Laureen ...
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3answers
398 views

Catch the liar(s)

Alice: "Bob is lying, so is Charlie!" Bob: "Charlie is lying, so is Alice!" Charlie: "Alice is lying, so is Bob!" Who is/are lying?
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2answers
199 views

Flowers in a circle Puzzle

Eight flowers, coded as A, B, C, D, E, F, G and H, are planted in a garden in the shape of a circle (not necessarily in that order). The flowers are of different types – Rose, Lotus, Daffodil, ...
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1answer
187 views

Find the radius

Information : AB = 8 CD = 7 O,B,D are centers of the respective circles Hint: Find hidden information/clue from the diagram to solve the puzzle. Note: diagram is not to scale; it is just for visual ...
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3answers
247 views

How can we solve this question? [closed]

The 22 students of the course of History of Italian Opera must write a short paper about at least two composers, they have a better grade, if they choose to write a paper about one more composer. ...
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2answers
2k views

The Two Identical Twins [closed]

There are 2 twins who think the same, look the same, sound the same, and act the same. The only difference is that 1 of them is male, 1 is female. Without asking the twins for their gender, how can ...
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3answers
297 views

Fish In The Fish Bowl [closed]

There are $x$ fish in a fish tank. They get fed the same fish food every day. They have varying opinions on the food. One fish says he only likes fish food that starts with the letter A. ...
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2answers
109 views

Fun Vacation to Maine [closed]

Some college friends decided to take a vacation in Maine together. They each had to chip in \$90 for the weeks' lodgings. They tried to convince three more people to go with them, to reduce the cost ...
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3answers
212 views

What was the police officer's idea? [closed]

Two police officers suspected a man of kidnapping. Without sufficient evidence they couldn't search his car or his home. They also couldn't interrogate him. One officer had an idea which later led to ...
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1answer
363 views

Count,Count How many legs?

You walk into your room to your bed. On the bed there are 5 monkeys, 2 cats and 3 dogs. So how many legs are total on the floor?
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6answers
326 views

Which door do you take?

You walk into a house with the owner of the house. It has no electricity what so ever. He locks the door behind you. You are stuck. You see two doors, Red and Green. Which door do you take?
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1answer
194 views

Direction of wind

On a bright and sunny day, in a small town, a large balloon (such as is usually used for advertising/promotional purposes of brands/products) is floating high in the air, tied with a rope on the ...
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1answer
308 views

A question about Pinocchio's nose [closed]

What happens to Pinocchio's nose if he says to another person "My nose is about to grow"? Does it grow? Does it stay the same? Something else?
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1answer
72 views

Give these Digits their own Place..Place them Right

In their own Circle. Such that the arrows point to successive numbers . Start with 1 and end with 9. There might be more arrows than necessary. Find the solution with least number of arrows ignored.
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5answers
230 views

Find The Radius Of All The Circles

Find the diameters of all the circles shown, given the information provided in the diagram below. All diameters are of integer length. P.S: the signature in the bottom right is mine and I own this.
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3answers
579 views

Cows eat too much [closed]

Cows are always hungry... 70 Cows eat all the plants on a pasture in 24 days. 30 Cows clear the same pasture in 60 days. How many cows are needed to clear the pasture by the end of 96th day?
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3answers
999 views

The barber paradox - Who shaves the barber? [closed]

All the men in a village either shave themselves or are shaved by a barber (himself a man from the village). The barber claims to shave only the male villagers who do not shave themselves. So who ...
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1answer
787 views

What is the age of the driver?

This is a simple and brilliant puzzle. You are driving a car from temple to home. The temple to home distance is 55km. The car moves at 60km/hrs. If it starts 8.32 am and reaches at ...
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2answers
366 views

Next number in the following sequence? [closed]

In following sequence, Find the next number? 85, 79, 73, 69, ?
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4answers
131 views

What am I to A? | Riddle

If teresa's daughter is my daughter's mother, what am I to teresa? Grandmother Mother Granddaughter I am teresa
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2answers
185 views

The Guys - Logic #3 - The Casino

Oh boy, the guys went to the casino.. Let's see what these three are up to tonight. I wonder if going to the casino was a good idea?? Maybe for a couple of them. Start the two minute timer... The ...
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2answers
767 views

Find the missing number : [closed]

Find the missing number in the following table. Answer Options are: 25 27 32 30
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1answer
664 views

Deduce the numbers! (Fourth edition)

The two perfect logicians $A$ and $C$ meet their colleague $B$ at an exam, and they are not aware of the fact that $B$ is a moron and a horrible mathematician. At the exam, the examiner informs them ...
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6answers
725 views

Three Wise Monkeys and a Crime [closed]

Is there any crime the three wise monkeys (who see no evil, hear no evil, and speak no evil) could collectively "witness" and not be able to indict the suspect?
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1answer
104 views

Tennis Players Puzzle

Five tennis players of USA were asked to rank 5 football teams - P, Q, R, S and T - of other countries from 1 to 5 as per their performances in last year’s tournament, where rank 1 being the highest ...
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6answers
4k views

What are the numbers?

Three perfect mathematicians with extremely strong memories are taking an exam. The examiner tells each of them a certain piece of information about $x$ and $y$, which two positive integers between ...
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votes
1answer
204 views

A guy once said he lies. I still think what he really does [closed]

If a guy says "I'm a liar", what could we deduce from it? Is he a liar or not? let us say he isn't a liar, then his statement that he's a liar affirms that he is a liar. Let us say he is a liar ...
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1answer
1k views

Coins, Dice, and Probability! [closed]

Background: It's time for a little bit of fun, your friends are playing a game and you decide to join them! Gamplay: You each sit down and play on a flat surface. You sit in a circle and each throw ...
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1answer
110 views

Number of days in a normal year expressed with five consecutive positive integers [closed]

Given $D$ is the total number of days in a normal year $a$, $b$ are positive integers $P$, $Q$, $R$, $S$, $T$ are consecutive integers Figure them out by combining the following six expressions ...
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1answer
274 views

RAT Addition and Multiplication?

If RAT = (R+A+T) × R×A×T,then what is RAT? Are there possibilities other than 000, 135, 144?
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5answers
29k views

Sum six unique digits to make 20

You have 6 boxes. You can use the digits from 1 to 9 but not 0. Digit repetition is not allowed. The total sum of the numbers/digits should be 20. $$ \huge\square\square\square\\ \huge\square\square\...
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1answer
367 views

Russian Roulette with a novel twist

The gun is loaded with a single bullet. You go first, and I always win. How is this possible?
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4answers
658 views

Figure out the missing card

Look at the colored cards with numbers on them (image above). Can you figure out the color of and what's on the mystery card? The correct answer may not be what it seems at first... HINT #1: HINT #...