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

What makes this number unique: 8,549,176,320?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What jumps when it walks and sits when it stands?

The more you take me, the more you leave me behind.
Who Am I?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

What is common among 11, 69, and 88?