World's Hardest Riddles With Answers | Best Riddles and Brain Teasers

#171 - Swimming Pool Dead Person Brain Teaser

Who is dead?

Person-1

Explanation:
Person-3: Some will say the answer to be person-3 as his body is floating in the water. But the question is do dead bodies float in water?. The answer is yes, but it takes at least 2 to 3 days for a dead body to float. In the starting 1 to 2 days, a dead body sink under the water, thereafter it starts floating. Thus, person-3 is not dead.

Person-2: There is vibration in the water. This makes us sure that person-2 is not dead.

Person-1: If you see closely, he is having a book in his hand and it is in the water. Also, he seems to be in a subconscious state.

So, the answer to this puzzle is Person-1.

#172 - Family Pizza Brain Teaser

What is wrong with the below pizza riddle?

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The kids have 4 slices of pizza in their hands but only three pieces are missing from the pizza box.

#173 - Who is the thief Puzzle

During a day trip to a beach, four friends - Bruno, Michele, Anthony, and Stew - had an unexpected incident when one of them managed to steal a watch from a guest.

Can you identify the thief?

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The thief turned out to be Anthony, who hid the watch inside a bucket.

#174 - Who is the murderer riddle Answer

Look at the picture carefully. Can you identify the murderer?

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The boy on the right is the one. The piece of his shirt is with the deceased girl, as marked.

#175 - find the mistake in the picture

Can you find a mistake in the picture below?

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As marked O(letter 'O') is written instead of 0(number zero)

#176 - Can you crack the code puzzle

A numeric lock has 3 digit code with the below rules:

(3,0,2)one number is correct and well-placed;
(3,5,6)one number is correct but wrong placed;
(5,7,4)Two numbers are correct but wrong placed;
(6,8,9)nothing is correct;
(6,7,0)one number is correct but wrongly placed

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405

#177 - Aeroplane Hijack puzzle

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

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If the officials thought he was jumping with a hostage, they would never risk giving him a faulty parachute.

#178 - Trolls Riddle

You are on your way to visit your Grandma, who lives at the end of the valley. It's her birthday, and you want to give her the cakes you've made.

Between your house and her house, you have to cross 7 bridges, and as it goes in the land of make believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake.

How many cakes do you have to leave home with to make sure that you arrive at Grandma's with exactly 2 cakes?

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2: At each bridge you are required to give half of your cakes, and you receive one back. Which leaves you with 2 cakes after every bridge.

#179 - Find The Next Number

What are the next three numbers in this series?

4, 6, 12, 18, 30, 42, 60, 72, 102, 108, ?, ?, ?

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The series lists numbers that are flanked by two prime numbers.

4 (3 and 5 are prime)
6 (5 and 7 are prime)
12 (11 and 13 are prime)
18 (17 and 19 are prime)
30 (29 and 31 are prime)
42 (41 and 43 are prime)
60 (59 and 61 are prime)
72 (71 and 73 are prime)
102 (101 and 103 are prime)
108 (107 and 109 are prime)

thus

138 (137 and 139 are prime), 150 (149 and 151 are prime), 180 (179 and 181 are prime

#180 - Famous Probability puzzle SHOOT

Mr. Black, Mr. Gray, and Mr. White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr. Black, who hits his shot 1/3 of the time, gets to shoot first. Mr. Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr. White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr. Black, where should you shoot first for the highest chance of survival?

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He should shoot at the ground.

If Mr. Black shoots the ground, it is Mr. Gray's turn. Mr. Gray would rather shoot at Mr. White than Mr. Black, because he is better. If Mr. Gray kills Mr. White, it is just Mr. Black and Mr. Gray left, giving Mr. Black a fair chance of winning. If Mr. Gray does not kill Mr. White, it is Mr. White's turn. He would rather shoot at Mr. Gray and will definitely kill him. Even though it is now Mr. Black against Mr. White, Mr. Black has a better chance of winning than before.