When can we add 2 to 11 and get 1 as the correct answer?

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

What is the word or phrase?

I have Rs.50 and I spend it in the way as below.

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Can you find a five letter word that is left with only two letters if one is removed?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Which Burger Is Different in below image?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?