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?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

I cannot talk, but I always reply when spoken to. What am I?

How many letters are in the alphabet?