How many times can you subtract the number two from the number fifty?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

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?

What month of the year has 28 days?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

I know a nine-letter word having only one vowel.
Do you ?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

I have an eye but still cannot see.

Who am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?