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

There are two arch enemies Messi and Ronaldo who hate each other to an extreme. One day both were going together and a Jeanie appeared in front of them. Jeanie grants 3 wishes to Ronaldo and one to Messi.

Messi replied smartly 'Give me twice whatever Ronaldo demands'.

Ronaldo asked his 1st wish 'Give me 10000 billion dollars. Soon Messi gets 2000 billion dollars.
Ronaldo asked for his 2nd wish 'Give me one mansion in every country in the world. Soon Messi gets two mansions in every country of the world?

What should be Ronaldo's third wish?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What breaks yet never falls, and what falls yet never breaks?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Can you count the number of triangles in the picture below?

How is a fly different from a mosquito?