I travel all around the world but always stay in the corner. What am I?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

What has to be broken before you can use it?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Can you solve the maths in the below-given picture equation?

Count the number of triangles in the picture below:

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?