Find the hidden tiger in the given optical illusion ?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

How can you make a TV, a bed, a dog, and a car liquid?

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

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

Can you spot the man between the coffee bean in the picture below ?