Why is a river so rich ?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

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?

How many letters are in the alphabet?

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

What word does this rebus represent?

meta meta
meta meta

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?