At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

If you say my name, I will no longer exist. What am I?

Can you count the number of blocks in the picture below?

Prove that twice of ten is the same as twice of eleven.

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I shave every day, but my beard stays the same. What am I?

Which number should replace the question mark?

Eight of us go fourth, not back, to protect our king from an attack. What are we?