You need to move three matchsticks to form three squares. Can you do it?

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

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

I can write cow in 13 letters.

Can You?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

Before Balboa discovered the Pacific Ocean, which was the largest ocean before that?

I know a nine-letter word having only one vowel.
Do you ?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

I have an eye but still cannot see.

Who am I?