This is a mensa question. The given solution is that the first number in a row multiplied by the second gives the last two rows: 9*2=18 6*4=24 5*7=35 8*8=64 However, it looks like you can also subtract the first from the second row then add it to the third to get the fourth: (9-2)+1=8 (6-4)+2=4 ...

Question: "X is the daughter of K. F is mother-in-law of Z. T is the sister of E. A is the sister of K. P is the father of Q. Z has only one son. Q is father of A. Z is mother of K. X is married to W. E is the brother of Q. R is the sister of Z. Y is the mother of R." Doubt: Where is went wrong i...

Please complete the following equations by filling in the missing digits. 5122 + 4454 = 4470 4847 + 1241 = 2440 4192 + 5077 + 4735 = 3912 740 + 2475 = 2280 614 + 548 + 4550 = 233 1562 + 4437 = 4??? 1932 + 2938 = 2??? 2404 + 73 = 2??? 1504 + 5032 = ??? Note: This post did not meet our quality st...

What are Marc, Oliver, Olivia, and Noah talking about: Marc: Its sure round! Oliver: If its not round I will eat my shoe! Olivia: Well, thats one's opinion. Its sure gleaming off that nice bright light of her's! Noah: Like it do we? Well we should go and take a closer look with our glassy ...

Rules: Shade some cells so that all shaded cell form one orthogonally connected area. Numbered cells are either tapa clue (represent the lengths of the shaded cell surrounding that clue) or pata clue (represent the lenghts of the unshaded cell surrounding that clue). If there are two or more num...

This is an extension to this great puzzle: Coin Flipping Puzzle. The main difference is we now have ternary sequences instead of binary sequences. Two criminals $A$ and $B$, were recently captured and brought to prison. They were then locked in two separate rooms. Known for being exceedingly smar...

I heard this puzzle in a book about ten years ago, and it seems that there's a lot of variants of it here, but I couldn't find this exact variation. You share a cell with two other inmates, and all are awaiting execution. The executioner walks in, and offered them to play a game to have a chance ...

By validly posed Sudoku means it doesn't break any Sudoku rules so only no duplicate 1 to 9 in rows, columns or square According to wikipedia: The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution. Many others sources including Sudopedia do not...

I would like help understanding my flawed logic in my following reasoning: The Blue-eyes Riddle is commonly expressed as A group of people with assorted eye colors live on an island. They are all perfect logicians -- if a conclusion can be logically deduced, they will do it instantly. No one kno...

This is adapted from a real game between GMs where white played the King's Gambit. I changed the position slightly (moved one piece) because there were actually two mates available, with one more prosaic than the other. The GM chose the less prosaic one, and I wanted to show it to you. Not crazy ...

Let's have the following two sequences: (S1) 6, 24, 90, 336, 1254, 4680,..... (S2) 12, 42, 156, 582, 2172, 8106,.... What do the squares of the numbers in the second sequence have in common?

If it is sunny, I am wet. If I wear a raincoat, I sweat. When it rains, there is no sun, but I am dry; and when there is wind and no sun, my sweat evaporates. In a rainy day, if it is windy and I wear a raincoat, which one of the following statements is most appropriate? a. I am dry b. I am wet c...

You are a shapeshifter that takes on the form of their victims and you've infiltrated the opposing kingdom's ranks, disguised as a lowly pawn . The opposing king has you presently assigned to the northeastern border to assist the rook in charge of the area: You send word back to your own kingdom...

While space was being cleared for a new building, a bunch of scitales came out of the water to munch on the worker's lunches, before falling asleep in the way of everything. You, having a knack for puzzling scenarios, have been sent out to drive away the serpents with a basilisk-whistle. However,...