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

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

You are trapped into a death trap by the famous jigsaw killer. As usual, a screen flashes in front of you and explains you the trap game. There are 100 pearls kept in a bowl in front of you and an empty bowl. Among the 100 pearls, 50 are white and 50 are black. You can divide them as you like into the two bowls. Once you are done, you will pull a lever, which will turn the room pitch black. The bowls will move and shuffle around. In the dark, you have to pick up one pearl from any bowl. Once you do that, the room will flood with lights again. If the peral you have in your hand is white, you will be allowed to live, but if the pearl you picked is black, the room will be filled with poisonous gas and you will die. How will divide the pearls to increase your chances of survival?

Prove that twice of ten is the same as twice of eleven.

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What is both possible and impossible at the same time?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?