Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

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?

Can you count the number of quadrilaterals in the picture below?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).