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

Why is Saturday stronger than Monday?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you count the number of blocks in the picture below?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

What is the word or phrase?

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?

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?