13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Can you spot the hidden girl in the picture below?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Replace the question mark with the correct number in the below-given picture?

With the help clues provided in the image, can you find the 5 digit key?

How many times can you subtract the number 5 from 25?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Can you count the number of squares in the figure below?