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

Can you find the missing piece of the Porsche?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

How many words can a pen with half refill write?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

When we see 2 but call 10?

What seven-letter word has hundreds of letters in it?

Find the next number in the series below

21 32 54 87 131 ?

What has many teeth, but cannot bite?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?