The more of this there is, the less you see. What is it?

A blonde put eyeliner on her head. Why?

What has many teeth, but cannot bite?

Which digit occurred maximum times between the number 1 and 1000?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

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