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

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

The dirtier I get, the whiter I look. Who am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?