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

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

What will you call your mother's brother's brother-in-law?

Count the number of triangles in the below picture?

Solve the mathematical equation in the picture below.

I know a nine-letter word having only one vowel.
Do you ?

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What am I?