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?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Keyboard words are not in alphabetical order, Why?

If eleven plus two equals one, what does nine plus five equal?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

How many triangles are there on the puzzle below?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

What goes up but never comes down?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?