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?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

A man dies of old age on his 25 birthday. How is this possible?

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

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Through your logical capabilities, can you make 7 an even?

In which direction should the missing arrow point?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?