Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

How can you take 2 from 5 and leave 4?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Find the number of squares in the below-given picture.

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

Next Number in the Series,

5, 16, 49, 104, ?