Can you decipher the following common phrase?

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

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

What is the coolest letter in the alphabet?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

How can you make number one disappear by adding something to it?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

what one word does the below rebus identifies?

What Adam and Eve do not have but the rest of the people have?

What can you hold in your right hand, but never in your left hand?