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

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

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

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?