Count the squares in the matchstick puzzle below?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

What does this Rebus Picture mean?

What is the next number in this matchsticks series riddle?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Our product and our sum always give the same answer. Who are we?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

What building has the most stories?