Why 1729 is a magic number? Answer Logically.

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

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

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?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?