Logic Riddles

Let us begin with the assumption that only one man is unfaithful. In that case everyone except wife of his will know about him. But his wife will know that all other men are unfaithful and on the statement of queen that there is at least one unfaithful man in the kingdom, she will shoot his husband at midnight.

Now assume that there are two unfaithful men in the kingdom. Then their wives will know about one unfaithful man. So they will wait for the midnight. But when nobody will be shot at midnight, they will come to know that there must be more than one unfaithful husband and they will come to know that their husband is also unfaithful. Thus both of them will shoot their husbands at midnight.

Assume that there are three unfaithful husbands. Their wives will know about the two unfaithful men and they will wait for two midnights but when nobody will be shot, they will come to know that there are more than two unfaithful men and they will understand that their own husband is unfaithful. Thus they will shoot their husbands at the third midnight.

Thus for any general case where there are n unfaithful husbands, each of their wives will believe there are n-1 unfaithful husband and will be expecting a shot on the midnight of n-1 day. When they don't hear any gunshot, they will realize that their own husband was the nth.

All you have to do is put a blue gem in any one of the sack and the other blue gems in the other sack. Doing this will provide you a shade under 3/4 probability of picking up a blue gem.

The first question I asked was "Is this restroom for men?" while pointing at one of them. I just remembered the word he said. Then I asked "Am I a man?" Now I knew that the second response will mean yes only. Thus I could compare the second response with the first to find out if the restroom I pointed at was correct or not.

If he says the same word, then the restroom I pointed at must be for males only. If he said a different word, the restroom I pointed at will be wrong and for females.

The journalist said "My head will be smashed with a hammer".

The man used an ice knife. The ice was capable of holding the knife pointing upwards and he dropped down on the chair with his back towards the knife. The moisture indicates the melting of ice.

He will plant three trees as the vertices of an equilateral triangle. Now imagine an equilateral triangle. Three more trees will be planted on the center of each of the side of the triangle. The remaining one tree will be planted at the centroid of the hypothetical equilateral triangle.

He will hang painting number 200 at that time. Every time he hangs the painting, the number of it corresponds with the angle between the minute and hour hand of the clocks.

When the trains meet, they will be approximately be equally distant from point A. Of course if you get into precise details, the train that left from point A will be closer to A by its own length as they are coming from different directions.

Three times is the most common answer however that is incorrect.

The small cogwheel will turn around four times.

You might already have deciphered that while turning against each other, the small wheel will turn three times (3*8) as the big wheel turns once (24 teeth). Now what we require is the big wheel to stop and the small one to turn around the big one. In this process, the small one will make another full turn on the way around the big one. Thus in total, it will make four turns.

Normally, a single or unmarried girl might feel shocked with such a question. But if you are smart, you can answer, 'I will be quite excited and will ask you for an off to celebrate with my husband.'

Since the question is hypothetical, you don't have to take it in wrong manner and you can answer in the same hypothetical manner as well.