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

What is so fragile that saying its name breaks it?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

Can you count the number of squares in the given picture?

Can you start the fire using two pieces of wood?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

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?