Replace the question mark with the number below given a simple math problem.

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?

If an electric train is travelling south, then which way is the smoke going?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

What came first, the chicken or the egg?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Move three sticks of the spiral below to form a square.

What does this rebus riddle mean?