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

Replace the question mark with the number below given a simple math problem.

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

How is the moon similar to a dollar?

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

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

What brings you down but never up?

John bought 150 chocolates but he misplaced some of them. His Father asked him how many chocolates were misplaced.
He gave the following answer to him:
If you count in pairs, one remains
If you count in threes, two remain
If you count in fours, three remain
If you count in fives, four remain
If you count in sixes, five remain
If you count in sevens, no chocolate remains.

Can you analyze the statements and tell us how many chocolates were lost?

The cream is heavier than Milk. True or False?