Who can jump higher than a Mountain?

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?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

Keyboard words are not in alphabetical order, Why?

The dirtier I get, the whiter I look. Who am I?

What is common among 11, 69, and 88?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Which tank will fill first?

How many triangles can you count in the figure given?