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 = ?

Which is the smallest number that you can write using all the vowels exactly once?

Can you identify the hidden rebus in the image below?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Find out the number of circles in the given picture having Illusion

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

Identify the hidden meaning behind this picture?

Can you find the 09 errors in the picture below?

How can you take 2 from 5 and leave 4?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?