There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

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 ?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What jumps when it walks and sits when it stands?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Can you replace the question mark with the correct number?

Move four matchsticks to the below square to form three squares?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Cristina was born in 1888. She just had her 30th birthday today how did that happen?