You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What is the next number in the series?

15 29 56 108 208 ?

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

A sundial has the fewest moving parts of any timepiece. Which has the most?

How many times do a clock's hands overlap in a day ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?