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?

Imagine you are in a room with no windows or doors. How will you get out?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

Why Wine Glass Stem is so long?

Which Travels Faster? Solve below famous picture riddle:

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

I am an odd number. Take away a letter and I become even. What number am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"