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

I am sure no one can have two things for dinner. what are they?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

What demands an answer, but asks no questions

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?