What does the below image rebus riddle means ?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Which of the below owl is odd one out?

Can you solve the photo plexer logic ?

What is the next number in this series?

4,12,84,3612....

What Deficiency does the below rebus represent?

VIT_MIN

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

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