I am white when I am dirty, and black when I am clean. What am I?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?