Latest Logic Riddles And Answer | Best Riddles and Brain Teasers

#371 - Crack The Code Puzzle

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue â€“ If I tell you any one character of the code, you can easily find out the number of vowels in the code word.

Can you find out the code word?

View Answer Discuss

The code word is TIE.

Suppose if you are told a character of MOD, then you canâ€™t identify if the number of vowels are one or two. Suppose that the character you are told of is M, then you can associate two words with it i.e. AIM (that has two vowels) and MOD (that has 1 vowel). You can say the same regarding other characters O and D as well.

Thus all those words that comprises of M, O or D in them can be ruled out. This points us to TIE. If you check with the characters of TIE, you will agree that it stands true for each of the characters of the word. Thus this is the code word.

#372 - Adobe Cool Logical Interview Puzzle

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with capacity 4 liters, 8 liters and 10 liters and you have a large tank of water. Now you have to measure 3 liters of water precisely using those buckets. How will you do it?

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It is impossible. The reason is that we are asked to measure 3 liters which is an odd number but the buckets we have can contain even liters of water only (4, 8 and 10). If you hoped to fill any of the bucket half, you will not be precise in measurement.

#373 - Math Figure Puzzle

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

$Math Figure Puzzle$

View Answer Discuss

He will plant three trees as the vertices of an equilateral triangle. Now imagine an equilateral triangle. Three more trees will be planted on the center of each of the side of the triangle. The remaining one tree will be planted at the centroid of the hypothetical equilateral triangle.

#374 - Tricky Logical Puzzle

I have one of the three numbers: 1, 2 or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

View Answer Discuss

You will ask, I am thinking of a number from 2 and 3. Is the number I am thinking of smaller than or equal to the number you have in your mind?

Now, if I reply no, then the number is 1.
If I reply yes, then the number is 3.
If I reply don't know, then the number is 2.

#375 - Suicide Riddle

A man is found dead. When the investigation is done, he is found dead with a knife in his back. A chair sits beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

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The man used an ice knife. The ice was capable of holding the knife pointing upwards and he dropped down on the chair with his back towards the knife. The moisture indicates the melting of ice.

#376 - Famous Probability Problem

You are offered an opportunity of winning a fortune. There are 100 precious black stones and 100 unworthy white stones. There are two different sacks labelled as "Heads" and "Tails". You can distribute the stones as per you wish. Then a coin will be flipped. Then you will have to choose a stone from the corresponding sack. If you pick up a black stone, all the fortune of black stones is yours but if you pick up white, you get nothing.

How will you distribute the stones so that you can maximize your chances of winning?

View Answer Discuss

If you put a single precious black stone in one bag and all the others in the other bag, it will give you almost three/fourth of the probability of picking up a precious black stone.

#377 - Maths Brain Twister

Two natural numbers are having a sum less than 100 and are both greater than one.

Ned knows the product of the numbers and Shawn knows the sum of numbers.

The following conversation takes place between them:
Ned: 'I am not aware of those numbers.'
Shawn: 'I knew you wouldn't be. I am not aware myself.'
Ned: 'Now I know them!'
Shawn: 'Now I know them, too!'

What are the two numbers?

View Answer Discuss

Product is 52 and sum is 17. The numbers are 4 and 13.

#378 - IQ Riddle

Its a test that will check your IQ.
Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

View Answer Discuss

First Step: Invert both the hourglasses.

Second step: When the 11 min hourglass is finished, invert it.

Third Step: When the 13 min hourglass is finished, flip the 11 min hourglass would have lost only 2 minutes till now. On inverting, we get to measure those two minutes.
Now 13 + 2 = 15 minutes.

In this way, fifteen minutes can be measured in just 3 steps.

#379 - Long Disgusting Riddle

Andrew was absent from school for most of the days and thus the principal called him. He asked Andrew for an explanation to which Thomas replied the following:

I don't have enough to attend school. I must have eight hours of sleep every day and if added for 365 days, it makes 122 days in a year. We have weekends off adding to 104 days of the year. The summer holidays are roughly 60 days. I take an hour for each meal adding to 3 hours a day and 45 days a year. I must spend 2 hours every day for exercising and recreation to stay physically and mentally fit which adds up to 30 days in a year.

If you add all of them, you will get 361 days as the answer. So I am left with only 4 days to attend the school.

Though the principal knows that Andrew is messing with his head, he is unable to point where Andrew is going wrong. Can you tell how he is calculating in a wrong manner?

View Answer Discuss

Fore mostly, Andrew is adding up a lot of double count7s. He is adding the time spent sleeping, eating and relaxing etc. separately while without deducting that time from the weekends and other holidays. Also, weekends occur is summer holidays as well. Thus these hours are being counted several times.

Another thing is that the school does not happen for 24 hours and thus the 4 days will count as 16 days of school even if a school commence for six hours.

#380 - Hard Calendar Puzzle

A contest is held on international level in December 2013. The finale of it is between an American and a British kid. Only name and date have to be mentioned on the paper for checking purpose. But when the checkers check it, they find out that both of them have same names. The papers cannot be told apart in any manner now.

What is the date of competition ?

View Answer Discuss

The date is 12 December 2013. For any other date, the checkers would have been able to identify the papers. Why? Because the British people write dates in Day/Month/Year Format and the American people write date in Month/Day/Year format. On 12 December, the date and month will be the same and thus there is no way to distinguish when the names are same as well.