Here are some arrows, all different, and all labelled.
What should be the label of the arrow in the center?
You can check your solution here
Category Archives: Logic
Optician
At the optician, I saw several spectacles for sale. The prices of the frames, still without the glasses, showed a very clear pattern.
What is the price of the one labelled with the question marks?
Usually you can find a new braintease here usually on Friday. Solutions are generally provided one week later.
You can check your solution here
Pattern code square and circle
Four combinations of a square and a circle have been labelled with a three letter code. What code should the combination in the middle have?
You can check your solution here
colour grid (2)
Usually I construct my puzzles in such a way that the puzzles can be made and solved by those who are colour blind. That is alas not the case with this weeks brainteaser, for which I apologize.
The question is: what colour should go into the white square with the question mark?
You can check your solution at here
What comes next?
Substitute digits for the question marks:
149 162 536 496 481 ???
This problem was posed before in the British magazine Games and Puzzles, issue 44, 1976, in a slight variation.
You can check your solution at here
Pattern codes – graphs
1) Graphs
What code goes to the question mark?
You can check your solution here
A new puzzle is published every friday. The solution is generally published one week later. I welcome your reactions on these puzzles: are they too easy, too difficult, are there any multiple solutions? How long did you need to solve it?
Letter square
Conside the following square with letters.
What number should go into the cell with the question mark?
Please try to solve the puzzles on your own. You are welcome to remark on the puzzles, and I love it when you comment variations, state wether they are too easy or too difficult, or simply your solution times. Please do not state the soultions – it spoils the fun for others. I usually make the solution available after one or two weeks through a link, which allows readers to check the solution without the temptation to scroll down a few lines before having a go at it themselves.
When you have solved this puzzle, you can check your solution here
You can find more puzzles like this one in our upcoming e-book on Logic Puzzles.
Lines and spheres
Color grid (1)
What number goes into the cell with the question mark?
1) Color grid*
You can check your solution at here
Please try to solve the puzzles on your own: your self confidence will grow. You are welcome to remark on the puzzles, and I love it when you comment variations, state wether they are too easy or too difficult, or simply your solution times. Please do not state the soultions – it spoils the fun for others. I usually make the solution available after one or two weeks through a link, which allows readers to check the solution without the temptation to scroll down a few lines before having a go at it themselves.
You can find more puzzles of this type in one of our free or paid upcoming e-books on Logic puzzles.
The Babuschka and the pearls
Before going home, Inspector Simon Mart visited a pearl shop on the island of KoaLoao, where every native was either a TruthTeller or a LieSpeaker, he decided he really had to take home a souvenir.
He looked around in one of the local pearl shops. It was not very large, but his eye fell on a nicely crafted Babuschka – one of those russian dolls where, when you open it, it contains another similar doll, which, when you open it, ok, you get it.
This babuschka contained 3 smaller dolls, and had six small pearls inlaid for the eyes of the dolls. He picked it up and weanted to buy it, but his eye fell on a pillow with 4 beautiful large pearls, some entire white, some entirely black. He remebered that all pearls on this island were either black or white.
“How many of these large pearls do you have?” Simon asked, interested.
“Not very many” the shopowner asnwered. “My neighbour next door has more, and he has 29 pearls of this size.”
“That doesnt tell me how many you have” the inspector remarked.
“Well, if I would put all my large pearls in a bag, both black and white, and you would take out two at random, the chances would be exactly 1 in 5 that you would have two black ones.”
“Don’t believe a word he says!” the servant in the shop warned him. “My boss is a notorious LieSpeaker! Our neighbour has 30 pearls of this size, and the chances are exactly 1 in 4 that you would take out 2 white pearls!”
“That makes things clear!” answered inspector Mart. “Thank you!”
How many pearls does the shop owner have? And who is speaking the truth?
Please try to solve the puzzles on your own. You are welcome to remark on the puzzles, and I love it when you comment variations, state wether they are too easy or too difficult, or simply your solution times. Please do not state the soultions – it spoils the fun for others. I usually make the solution available after one or two weeks through a link, which allows readers to check the solution without the temptation to scroll down a few lines before having a go at it themselves.
When you have solved this puzzle, you can check your solution here
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