Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

Can you place six X (crosses) in below board without making three in a row in any way ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Rearrange the letters in "new door" to make one word.

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?