I have an eye but still cannot see.

Who am I?

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?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What is the end of everything?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Complete the table series riddle by finding the number that can replace "??".

Can you write down eight eights so that they add up to one thousand?

Can you solve the maths in the below-given picture equation?