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

Can you find the 09 errors in the picture below?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

Can you find out which options fits best with the missing column?

There is a place where if I stand up straight, I will still be considered sideways.

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

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