Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What is full of holes but still holds water?

What is the next number in this matchsticks series riddle?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

What building has the most stories?

What word is represented by this rebus?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

what does this picture(rebus) riddle means ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?