81 x 9 = 801. What must you do to make the this equation true?

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

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

Can you make a fire with just a single stick?

What does this rebus mean?

O
N
C
E
TIME

Which digit occurred maximum times between the number 1 and 1000?

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?

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

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

These types of puzzles are known as charades. What you have to do is to find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be the 'office'.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.