Eight of us go fourth, not back, to protect our king from an attack. What are we?

What has hands, but can’t clap?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What number comes next in the series?

5 15 5 18 5 24 14 20 _