Aitana's, Anna Carrera's and Gerard's challenges:

This is Aitana and here you are my challenge:

You are in a dark room.

There is a cupboard with three drawers. In the first drawer at the top there are 20 pairs of white socks and 20 pairs of black socks.

Questions: How many socks do I have to take from the drawer at least to get 2 socks of the same colour?

 

Anna Carrera has prepared this for you:

Look at this dog made of sticks. It seems it is walking along the street.

But suddenly a car runs over the dog.

Now what’s the dog’s shape once the car has run over him.  Only move 2 sticks.

 

Gerard loves football and here you are his challenge:

In Barcelona Football Club pitch 99.000 people can have a seat.

At 8.00 the stadium gates are opened and people can get into it.

At 10.00 PM 11.000 supporters have just arrived and there are still 1.779 empty seats.

Question: How many people were the in the stadium at 9.59 PM?