Solve below rebus puzzle?

What has one letter and starts with an E?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

What has 88 keys?

How could a baby fall out of a twenty-story building onto the ground and live?

Which flower has two lips?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

Find the hidden tiger in the given optical illusion ?

Why is it very easy to weigh a fish?

What can go through glass without breaking it?