Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What jumps when it walks and sits when it stands?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?