What always comes into a house through the keyhole?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

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?

Count the number of triangles in the picture below:

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Can you find out who is the kidnapper in below Picture and why, Explain ?