2, 3, 5, 9, 17, _ What is the next number in the sequence?

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?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Why is 6 afraid of 7?

Can you find the key in the picture below?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Find the last number in the series below:

voN luJ yaM raM ---

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.