Remove two matchsticks to make the below equation correct.

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

10+10 and 11+11 can give you the same answer.

Explain how?

What is the largest number you can write with just 3 digits?

I have no life, but I can die. What am I?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?