If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Can you write down eight eights so that they add up to one thousand?

What am I?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

A man dies of old age on his 25 birthday. How is this possible?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

You bought me for dinner but never eat me. What am I?

I shave every day, but my beard stays the same. What am I?

I have branches, but no fruit, trunk or leaves. What am I?