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?

Which Travels Faster? Solve below famous picture riddle:

Solve the puzzle by telling what does below picture means.

I’m orange, I wear a green hat and I sound like a parrot. What am I?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What is the centre of gravity?