What is full of holes but still holds water?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you place three balls such that the equation shown in the picture holds true?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

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.