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| Puzzles for adults |
Puzzles For Adults 1 : Popular Age Problem
Difficulty ★★★★☆ Popularity ★★★★★
Two old friends, Jack and Bill, meet after a long time.
Three kids
Jack: Hey, how are you man?
Bill: Not bad, got married and I have three kids now.
Jack: That’s awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool… But I still don’t know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh now I get it.
How old are Bill’s kids?
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Puzzles For Adults 2 : Puzzle In A Puzzle
Difficulty ★★★★☆ Popularity ★★★★★
What are the next two letters in the following series and why?
W A T N T L I T F S _ _
*Hint: Check Puzzle Title
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Puzzles For Adults 3 : Sherlock Holmes Cipher Puzzle
Difficulty ★★★★★ Popularity ★★★★☆
Sherlock, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:
710 57735 34 5508 51 7718
Currently there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?
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Puzzles For Adults 4 : Albert Einstein Cipher Puzzle
Difficulty ★★★★★ Popularity ★★★★☆
Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.
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Puzzles For Adults 5 : Find The Next Number
Difficulty ★★★★★ Popularity ★★★★☆
What are the next three numbers in this series?
4, 6, 12, 18, 30, 42, 60, 72, 102, 108, ?, ?, ?
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Puzzles For Adults 6 : Wise Cipher Riddle
Difficulty ★★★★☆ Popularity ★★★☆☆
Decipher
yyyy u r, yyyyy u b, i c u r y+y 4 ? by sharks. How would you survive?
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Puzzles For Adults 7 : 2 Eggs 100 Floors Puzzle
Difficulty ★★★★★ Popularity ★★★★★
-> You are given 2 eggs.
-> You have access to a 100-storey building.
-> Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100 th floor.Both eggs are identical.
-> You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
-> Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process
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Puzzles For Adults 8 : Aeroplane Hardest Quiz
Difficulty ★★★★★ Popularity ★★★☆☆
The puzzle question is : On Bagshot Island, there is an airport. The airport is the homebase of an unlimited number of identical airplanes. Each airplane has a fuel capacity to allow it to fly exactly 1/2 way around the world, along a great circle. The planes have the ability to refuel in flight without loss of speed or spillage of fuel. Though the fuel is unlimited, the island is the only source of fuel.
What is the fewest number of aircraft necessary to get one plane all the way around the world assuming that all of the aircraft must return safely to the airport? How did you get to your answer?
Notes:
(a) Each airplane must depart and return to the same airport, and that is the only airport they can land and refuel on ground.
(b) Each airplane must have enough fuel to return to airport.
(c) The time and fuel consumption of refueling can be ignored. (so we can also assume that one airplane can refuel more than one airplanes in air at the same time.)
(d) The amount of fuel airplanes carrying can be zero as long as the other airplane is refueling these airplanes. What is the fewest number of airplanes and number of tanks of fuel needed to accomplish this work? (we only need airplane to go around the world)
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Puzzles For Adults 9 : Brain Twister Puzzle
Difficulty ★★★★☆ Popularity ★★★★★
2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??
Solve it?
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Puzzles For Adults 10 : Pyramid Number Puzzle
Difficulty ★★★★☆ Popularity ★★★★★
The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
Question 1: What is the next two rows of numbers?
Question 2: How was this reached?
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Puzzles For Adults 11 : Puzzle Boat
Difficulty ★★★★☆ Popularity ★★★★☆
At the local model boat club, four friends were talking about their boats.
There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.
Alan didn't have a yellow boat. Brian didn't have a red boat, but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.
Can you work out which friend had which coloured boats?
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Puzzles For Adults 12 : Sequence Quiz
Difficulty ★★★★☆ Popularity ★★★★☆
Find Next Number in the Sequence
2 9 3 1 8 4 3 6 5 7 ?
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Puzzles For Adults 13 : Challenging Mind puzzles
Difficulty ★★★★★ Popularity ★★★★☆
You are the ruler of a medieval empire and you are about to have a celebration tomorrow. The celebration is the most important party you have ever hosted. You've got 1000 bottles of wine you were planning to open for the celebration, but you find out that one of them is poisoned.
The poison exhibits no symptoms until death. Death occurs within ten to twenty hours after consuming even the minutest amount of poison.
You have over a thousand slaves at your disposal and just under 24 hours to determine which single bottle is poisoned.
You have a handful of prisoners about to be executed, and it would mar your celebration to have anyone else killed.
What is the smallest number of prisoners you must have to drink from the bottles to be absolutely sure to find the poisoned bottle within 24 hours?
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Puzzles For Adults 14 : Cipher Age Puzzle
Difficulty ★★★★★ Popularity ★★★★☆
If Susan is 10, Arabella is 20, and Jim and Neal are both 5, but Richard is 10, how much is Jennifer by the same system?
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Puzzles For Adults 15 : February Maths Puzzle
Difficulty ★★★★☆ Popularity ★★★★★
Using eight eights and addition only, can you make 1000?
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Puzzles For Adults 16 : Cross Bridge Puzzle
Difficulty ★★★★☆ Popularity ★★★★☆
Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?
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Puzzles For Adults 17 : Hardest Balance Logic Puzzle
Difficulty ★★★★★ Popularity ★★★★★
You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.
Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.
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Puzzles For Adults 18 : Unlock The Distance Puzzle
Difficulty ★★★★★ Popularity ★★★★★
Distances from you to certain cities are written below.
BERLIN 200 miles
PARIS 300 miles
ROME 400 milesAMSTERDAM 300 miles
CARDIFF ??? miles
How far should it be to Cardiff ?
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Puzzles For Adults 19 : Building Puzzle
Difficulty ★★★★☆ Popularity ★★★★☆
A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?
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Puzzles For Adults 20 : Maths Puzzle
Difficulty ★★★★☆ Popularity ★★★☆☆
How can I get the answer 24 by only using the numbers 8,8,3,3.
You can use the main signs add, subtract multiply and divide.
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Last Updated:2012-03-24