There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

What occurs twice in a week, once in a year but never in a day?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

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

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Which Travels Faster? Solve below famous picture riddle:

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?