Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

What number divided by 4 is the same as that number minus 4?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

The cream is heavier than Milk. True or False?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Can you decipher the below rebus?

PBLUESAISNUERSES

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H