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

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

If an electric train is travelling south, then which way is the smoke going?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Can you count the number of triangles in the given figure?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What is 3/7 chicken, 2/3 cat and 2/4 goat?