Logic Riddles

Logic riddles with answers involve looking at situations and making judgements about them by ruling out impossibilities. If you like solving maths puzzles, you will most probably like logic riddles as well.

Blind Bartender’s Problem

Four glasses are placed on the corners of a square Lazy Susan (turntable). Some of the glasses are upright (up) and some upside-down (down).

A blindfolded person is seated next to the Lazy Susan and is required to re-arrange the glasses so that they are all up or all down, either arrangement being acceptable.

The glasses may be re-arranged in turns subject to the following rules.

Any two glasses may be inspected in one turn and after feeling their orientation the person may reverse the orientation of either, neither or both glasses.
After each turn the Lazy Susan is rotated through a random angle.
At any point of time if all four glasses are of the same orientation, a bell will ring.

Can you devise an algorithm which allows the blindfolded person to ensure that all glasses have the same orientation (either up or down) in a finite number of turns? The algorithm must not depend on luck.

Riddle Answer

Egg Spinning Competition

You are a junior detective investigating a case. Boys at an apartment complain that every day, they have an egg spinning competition with only raw eggs, and every day one particular boy wins.

The boys want you to find out how. You are observing the boy spinning an egg when suddenly it drops to the floor. The apartment clerk casually hands him a broom to clean it up, as if it happens every day. You now know why the boy always wins the daily competition. How?

Riddle Answer

Three Boxes

On the table before you are three small boxes, labeled A, B , and C. Inside each box is a colored plastic chip. One chip is red, one is white, and one is blue. You do not know which chip is in which box. Then, you are told that of the next three statements, exactly one is true:

Box A contains the red chip
Box B does not contain the red chip
Box C does not contain the blue chip

Determine the color of the chip in each box.

Riddle Answer

Bathroom with Stone Walls

You are in a bathroom with stone walls and no windows. You start to run a bath when the handles come off and there is no way of turning the tap off. You can’t escape because the door is locked and there are no windows. The room will flood and you will drown. How can you save yourself?

Riddle Answer

Bank Robbery

A bank is getting robbed and one of the robbers tells one of the tellers to give him all of the money. The teller tells him she doesn’t have access to it.

Suddenly the phone rings. The robber tells the teller to answer it and not give them away. She picks up the phone and it happens to be her mother. She tells her mother “Is this an emergency mom? Call me when I get home, I could use some help painting.” Then she hangs up.

The robbers continue to try to get into the vault but twenty minutes later the police show up with the tellers mom and arrest them all.

How did the police know about the robbery?

Riddle Answer

Logic Riddles

Blind Bartender’s Problem

Egg Spinning Competition

Three Boxes

Bathroom with Stone Walls

Bank Robbery

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