If eleven plus two equals one, what does nine plus five equal?

Decode this picture on T-Shirt and tell what it says ?

What is full of holes but still holds water?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What's the only room from which no one can enter or leave

What type of tree can I carry in my hand?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?