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

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

How many times can you subtract the number 5 from 25?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What country can make you shiver?

Which word does the below Plexor means ?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?