What is the centre of gravity?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

Can you solve the below tricky visual equation?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

You need to arrange three 7 and mathematical symbols to form number 1?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

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 complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

People put me on the table and cut me but do not eat me. What am I?