There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?

Can you start the fire using two pieces of wood?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you count the number of squares in the figure below?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

A man dies of old age on his 25 birthday. How is this possible?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

The more it dries, the wetter it becomes. Can you tell what it is?