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

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

What word is pronounced the same if you take away four of its five letters?

They are three errirs in this question. Can you find them?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

Can you solve the maths in the below-given picture equation?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

Which of the below owl is odd one out?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?