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

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

Can you decipher the below rebus?

PBLUESAISNUERSES

What number comes next in the series?

5 15 5 18 5 24 14 20 _

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

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?