What is the riddle which can be asked all day with a different correct answer each time.

Count the number of triangles in the picture below:

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Identify the 10 differences between the two given pictures.

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Why do you find that most of the buildings are deprived of the 13th floor?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?