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

O T T F F S S ?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

I make two people out of one. What am I?

What is next number in the pattern below:

131 517 192 123 ?

What makes this number unique: 8,549,176,320?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Why is 6 afraid of 7?